#include<bits/stdc++.h>
using namespace std;
#define e4 ios_base::sync_with_stdio(false); cin.tie(NULL)
#define endl '\n'
#define ll  long long
#define test_case int tc;cin>>tc;while(tc--)


int main() {

	
	  e4;

	 int a,b,c;

	 cin>>a>>b>>c;


	 vector<int> v;

	 v.push_back(a);
	  v.push_back(b);
	   v.push_back(c);

	 sort(v.begin(),v.end());

	 set<int> st;

	 st.insert(a);
	  st.insert(b);
	   st.insert(c);

	 if(v[0]+v[1]<v[2]) cout<<" Not a triangle";

	 else {
	 	if(st.size()==3) cout<<"Scalene";
	 	else if(st.size()==1) cout<<"Equilateral";
	 	else cout<<"Isosceles";
	 }

}

	
		   //           S m o t h e r e d  M a t e !!		 //