#include <iostream>
using namespace std;

int main() {

    int a, b, c;
    cin >> a;
    cin >> b;
    cin >> c;

    if(a + b > c and a + c > b and b + c > a) {
        cout << "DA" << endl;
    }
    else {
        cout << "NE" << endl;
    }

    return 0;
}