#include <iostream>
using namespace std;
int main() {
long long a, b, c;
cin >> a >> b >> c;
// Kiểm tra điều kiện để ba thanh kẹo có thể tạo thành tam giác
if (a + b > c && a + c > b && b + c > a) {
cout << "YES" << endl;
} else {
cout << "No" << endl;
}
return 0;
}
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