1214A.cpp

#include <bits/stdc++.h>

using namespace std;

int main()
{
    long long n,d,e;
    cin >> n >> d >> e;
    long long x1, x2, y1, y2, ans1 = INT_MAX, ans2 = INT_MAX;
    x1 = n/(5*e);
    while(x1 != -1) {
        y1 = (n-(5*e*x1))/d;
        ans1 = n-(5*e*x1)-(y1*d);
        ans2 = min(ans1,ans2);
        if(ans2 == 0) {
            cout << ans2;
            return 0;
        }
        x1--;
    }
    ans1 = ans2;
    y2 = n / d;
    while(y2 != -1) {
        x2 = (n-(y2*d))/(5*e);
        ans2 = n-(5*e*x2)-(y2*d);
        ans1 = min(ans1,ans2);
        if(ans1 == 0) {
            cout << ans1;
            return 0;
        }
        y2--;
    }
    cout << ans1;

    return 0;
}