#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef long double ld;
#define REP(i, n) for (int i = 0; i < (n); ++i)
#define REPR(i, n) for (int i = n - 1; i >= 0; --i)
#define FOR(i, m, n) for (int i = m; i < n; ++i)
#define FORR(i, m, n) for (int i = m; i >= n; --i)
#define ALL(v) (v).begin(),(v).end()
template<class T>bool chmax(T &a, const T &b) { if (a<b) { a=b; return 1; } return 0; }
template<class T>bool chmin(T &a, const T &b) { if (b<a) { a=b; return 1; } return 0; }
const ll INF=1LL<<60;
const int inf=(1<<30)-1;
const int mod=1e6+3;
int dx[8]={1,0,-1,0,-1,-1,1,1};
int dy[8]={0,1,0,-1,-1,1,-1,1};
int main(){
    cin.tie(0);
    ios::sync_with_stdio(false);
    ll a,b,c,d,e;cin >> a >> b >> c >> d >> e;
    ll ans=0;
    ll now=0;
    for(int i=1;i<=(b-c)*a;i++){
        if(i==1){
            ans+=d;
            now=d;
            continue;
        }
        if(i%10==0){
            if(e<=now){
                ans+=now-e;
                now-=e;
            }
            else{
                ans+=now;
            }
        }
        else ans+=now;
    }
    cout << ans << endl;
}