#include <iostream>
using namespace std;

int main() {
    int a, b, c;
    cin >> a >> b >> c;

    if (a + b > c && a + c > b && b + c > a) {
        cout << "Yes" << endl;
    } else {
        cout << "No" << endl;
    }

    return 0;
}    
/**************************************************************
	Problem: 1045
	User: linmiaoling
	Language: C++
	Result: Accepted
	Time:41 ms
	Memory:2072 kb
****************************************************************/