#include <bits/stdc++.h>
using namespace std;

#define FAST ios_base::sync_with_stdio(false);cin.tie(NULL);
using ll = long long;

int main() {
  FAST;

  int x, y, z;
  cin >> x >> y >> z;

  set<int> st = {x, y, z};
  vector<int> a = {x, y, z};
  sort(a.begin(), a.end());
  
  if (a[0] + a[1] > a[2]) {
    if ((int)st.size() == 1) cout << "Equilateral" << "\n";
      else if ((int)st.size() == 2) cout << "Isosceles" << "\n";
      else cout << "Scalene" << "\n";
  } else {
    cout << "Not a triangle" << "\n";
  }

  return 0;
}