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

#define rep(i, a, b) for (int i = a; i < b; i++)
using ll = long long;

int main(){
    vector<int> a(3);
	rep(i, 0, 3) {
		cin >> a[i];
	}
    sort(a.begin(), a.end());
    string ans = "No";
    if(a[0] + a[1] > a[2]) ans = "Yes";
    cout << ans << endl;
}