#include <bits/stdc++.h>

using namespace std;
using ll = long long;
const ll mod = 1e9 + 7;

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);

    map < ll, ll > mp;
    vector < ll > arr(3);
    for (ll i = 0; i < 3; i++) {
        ll x;
        cin >> x;
        arr[i] = x;
        mp[x]++;
    }

    if (arr[0] + arr[1] > arr[2] && arr[1] + arr[2] > arr[0] && arr[2] + arr[0] > arr[1]) {
        if (mp.size() == 3) cout << "Scalene\n";
        else if (mp.size() == 2) cout << "Isosceles\n";
        else cout << "Equilateral\n";
    }
    else cout << "Not a triangle\n";




    return 0;
}
// Author : Raj (raj_singh35)