Program p_13_2;
Var
a, b, c, d: real;
mab, mcd, max: real procedure max2(x, y: real; var z: real);
begin
If x >= y Then
z := x
Else
z := y;
end;
begin
Write(’ Vvedite 4 isla ’);
Readln(a, b, c, d);
max2(a, b, mab);
max2(c, d, mcd);
max2(mab, mcd, max);
writeln(’ Bolshee 4 islo = ’, max);
end.