uses crt;
var a,b,c:integer;
begin
clrscr;
writeln('a, b, c = ');
readln(a,b,c);
if (a+b>c)and(a+c>b)and(b+c>a) then
if (a*a+b*b=c*c)or(a*a+c*c=b*b)or(b*b+c*c=a*a) then write('Trikutnik prjamougolnyj')
else write('Trikutnik ne prjamougolnyj')
else write('Trikutnika ne sush4ectvujet');
readkey
end.