#include<bits/stdc++.h>
using namespace std;
int main() { 
  int a,b,c;
  cin>>a>>b>>c;
  if (a>b) {
  	swap(a,b);
  }
  if (a>c) {
  	swap(a,c);
  }
  if (b>c) {
  	swap(b,c);
  }
    if (a+b>c) cout<<"Yes";
    else cout<<"No";

    return 0;
}
/**************************************************************
	Problem: 1045
	User: wangyousi
	Language: C++
	Result: Accepted
	Time:36 ms
	Memory:2072 kb
****************************************************************/