#include <bits/stdc++.h>
using namespace std;

int main() {
    int p;
    int n[4];
    cin>>p;
    int v[4] = {1, 5, 10, 25};
    for (int i=0; i<4; ++i) cin>>n[i];
    int ans = 0;
    for (int i = 0; i < 30; ++i) {
        for (int j = 0; j < 10; ++j) {
            for (int k = 0; k < 10; ++k) {
                int t[4];
                t[0] = max(0, n[0] - i);
                t[1] = max(0, n[1] - j);
                t[2] = max(0, n[2] - k);
                t[3] = n[3];
                int pp = p;
                int lans = 0;
                for (int d = 0; d < 4; ++d) {
                    int f = min(pp / v[d], t[0]);
                    lans += f;
                    pp -= f * v[d];
                }
                if (pp == 0) ans = max(ans, lans);
            }
        }
    }
    if (ans == 0) cout << "Impossible" << '\n';
    else cout << ans << '\n';
    return 0;
}