#include <bits/stdc++.h>
using namespace std;
int main(){
	cin.tie(nullptr);
	ios_base::sync_with_stdio(false);
	int A, B, C;
	cin >> A >> B >> C;
	if (A + B > C and A + C > B and B + C > A){
		cout << "Yes" << endl;
	} else {
		cout << "No" << endl;
	}
}