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

int main(){
	int a, b, c;
	cin >> a >> b >> c;
	if(a + b > c && b + c > a && c + a > b){
		cout << "Yes" << "\n";
	}else{
		cout << "No" << "\n";
	}
	return 0;
}