2017-yo-t1.cpp

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

#define int long long

#define PB push_back
#define PPB pop_back
#define MK make_pair
#define ALL(V) V.begin(), V.end()
typedef pair<int, int> pii;
typedef pair<double, double> pdd;
typedef pair<string, int> psi;
typedef pair<int, pii> pipii;

constexpr int INF = 1LL << 61;
//constexpr int MOD = 1000000007;
//constexpr int MAX_N = 55;

signed main() {
    ios::sync_with_stdio(false);
    cin.tie(0);

    int a, b, c, d, e;
    cin >> a >> b >> c >> d >> e;

    int ans = 0;
    if (a < 0) {
        ans += c * (-a) + d;
        a = 0;
    }

    if (0 <= a) {
        ans += e * (b - a);
    }

    cout << ans << endl;
}