#include <iostream>
#include <cmath>
#include <stack>
#include <queue>
#include <algorithm>
using namespace std;
int main()
    {
        ios_base::sync_with_stdio(false);
        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;
    }
// ({})