#include <iostream>
using namespace  std;

int main() {
    int K, A, B;
    cin >> K >> A >> B;
    
    for(int i = 0; i < 1000; i++) {
        if(K + i * A == i * B) {
            cout << i << endl;
            return 0;
        }
    }
    cout << "NE" << endl;
    
    return 0;
}