uses crt;
const nmax=10;
type matr=array[1..nmax,1..nmax] of real;
procedure MxM(a1,a2:matr;n:byte;var a3:matr);
var k,j,i:byte;
begin
for k:=1 to n do
for j:=1 to n do
 begin
  a3[k,j]:=0;
  for i:=1 to n do
  a3[k,j]:=a3[k,j]+a1[k,i]*a2[i,j];

 end;
end;

var e,n,i,j,q,m,l,x,k : integer;
sum:real;
A,B,C:matr;
begin clrscr;
      writeln ('vvedite poradok matricy А (ne bolee 10!)');
      readln (n);
        if (n>10) or (n<=0) then
              begin
                repeat
                writeln('vvedite poradok matricy А (ne bolee 10!)');
                readln (n);
                until (n>0) and (n<11);
              end;

                  for i:=1 to n do
                   for j:=1 to n do
                    begin
                    write('A[',i,',',j,']=');
                    readln (A[i,j]);
                    end;
            writeln ('vasha ishodnaaya matrica A:');
                 for i:=1 to n do
                      begin
                         for j:=1 to n do
                             write (A[i,j]:8:2);
                             writeln;
                      end;
                      write('vvedite stepen m   = ');
                      readln (m) ;
                      q:=1;

                      c:=A;

                          repeat
                         MxM(c,a,n,b);
                            c:=b;
                          q:=q+1;
                             until q<=m;

                         writeln ('vasha poluchennaya matrica B:');
                 for i:=1 to n do
                      begin
                         for j:=1 to n do
                             write (C[i,j]:8:2);
                             writeln;
                         end;
                         
                        write('vvedite nomer k stroki (ne bolshe ',n,'!) = ');
                        readln (l) ;
                           if (l>n) or (l<=0) then
                             begin
                              repeat
                              writeln('vvedite nomer k stroki (ne bolshe ',n,'!!!) = ');
                              readln (l);
                              until (l<=n) and (l>0) ;
                             end;
              write('vvedite chislo = ');
              readln(x);
                for i:=1 to n do
                 c[i,j]:=a[l,i]*x;
                   for i:=1 to n do
                     a[l,i]:=c[i,j];
              writeln ('poluchennaya matrica B:');
                     for i:=1 to n do
                             begin
                                  for j:=1 to n do
                                     write (c[i,j]:8:2);
                                     writeln;
                             end;
                     sum:=0;
                         for i:=1 to n do
                          for j:=1 to n do
                             begin
                               if (i>j) and (c[i,j]<0) and (j mod 2=0) then
                                  sum:=sum+c[i,j];
                             end;
              writeln ('summa otricatelnyh pod glavnoy diagonalyu B = ',sum);
                writeln ('dlya vihoda nazhmite  enter.');
                 readln;
                         
                    end.