#include <bits/stdc++.h>

using namespace std;

int main() {
    float height, weight;
    cin >> height >> weight;

    float BMI = weight / (height * height); //注意这个扩号
    if (BMI < 18.5) cout << "thin" << endl;
    if (BMI >= 18.5 && BMI < 24) cout << "normal" << endl;
    if (BMI >= 24) cout << "fat" << endl;
    return 0;
}