#include <iostream>

using namespace std;

int main(){
    int a,b,c;
    cout << "Enter triangle's sides\n";
    int ar[3];
    for (int i = 0; i < 3; ++i)
        cin >> ar[i];
    if (ar[0] <= 0 || ar[1] <= 0 || ar[1] <= 0){
        cout << "trinagle does not exist";
        return 0;
    }

    a = min(min(ar[0],ar[1]),ar[2]);
    c = max(max(ar[0],ar[1]),ar[2]);
    b = ar[0]+ar[1]+ar[2] - a - c;
    if (cin.fail()) {cout << "enter data again"; return 0;}
    if (a + b < c) {
        cout << "triangle does not exist";
        return 0;
    }
    if (a*a + b*b == c*c)
        cout << "right triangle";
    else
        cout << "not right triangle";
}