#include <iostream>

using namespace std;

int main(){
    int k, a, b;
    cin >> k >> a >> b;
    int denovi = -1;
    for(int i = 0; i <= 20; i++) {
        if(k + i * a == i * b) {
            cout << i << endl;
            return 0;
        }
    }
        cout << "NE" << endl;


return 0;
}