uses crt;
var
a: array [1 .. 100, 1 .. 100] of integer;
i, j, m, s: integer;
function sled(var m: integer): integer;
var
sum: integer;
begin
sum := 0;
for i := 1 to m do
begin
for j := 1 to m do
begin
if i = j then
sum := sum + a[i, j];
end;
end;
end;
begin
clrscr;
writeln('vvedite rasmernost massiva');
readln(m);
randomize;
for i := 1 to m do
begin
for j := 1 to m do
begin
a[i, j] := random(20);
write(a[i, j]:3);
end;
writeln;
end;
writeln;
s := sled(m);
writeln(s);
readln;
end.