#include <iostream>
using namespace std;
int main() {
int aRON , bRON, cRON;
cin >> aRON >> bRON >> cRON;
if (cRON == aRON + bRON); {cout << "DA";}
if (cRON /=aRON + bRON); {cout << "NU"; }
return 0;
}
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