#include 
using namespace std;
int main()
{
    int K, A, B;
    cin >> K >> A >> B;
    if(B == A) {
        cout << "NE" << endl;
        return 0;
    }
    if(K % (B - A) == 0) {
        cout << K / (B - A) << endl;
    }
    else {
        cout << "NE" << endl;
    }
    return 0;
}