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

int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    array<int, 3> a;
    for(auto &&v : a) cin >> v;
    sort(a.begin(), a.end());
    cout << (a[2] < a[0] + a[1] ? "Yes" : "No") << '\n';
}