#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)

int main() {
    cin.tie(nullptr);
    ios_base::sync_with_stdio(false);
    vector<int> a(3);
    rep(i, 3) cin >> a[i];
    sort(a.begin(), a.end());
    cout << (a[0] + a[1] > a[2] ? "Yes" : "No") << endl;
    return 0;
}