var mass:array[1..100,1..100] of integer; i,j,n:integer; n:=mass[1,1]; for j:=1 to 100 do begin for i:=1 to 100 do begin if i=j then begin if (mass[i,j]>0) and (mass[i,j]<n) then n:=mass[i,j]; end; end; end;