#include 
using namespace std;

int main() {
    int k, a, b;
    cin >> k >> a >> b;
    
    if(a >= b) {
        cout << "NE" << endl;
    }
    else {
        if(k % (b - a) == 0) {
            cout << k / (b - a) << endl;
        }
        else {
            cout << "NE" << endl;
        }
    }
    return 0;
}