#include<bits/stdc++.h>
#define ll long long
#define endl '\n'

using namespace std;

int32_t main() {
    ios_base :: sync_with_stdio(0);
    cin.tie(0); cout.tie(0);

    int a, b, c;
    cin >> a >> b >> c;
    vector<int>m(3);
    m[0] = a, m[1] = b, m[2] = c;
    sort(m.begin(), m.end());

    if (m[2] <= m[0] + m[1]) {
        if (a == b && b == c) cout << "Equilateral" << endl;
        else if (a == b || b == c || a == c) cout << "Isosceles" << endl;
        else cout << "Scalene" << endl;

    }
    else {
        cout << "Not a triangle" << endl;
    }

    return 0;
}