#include <cstdlib>
#include <cctype>
#include <cstring>
#include <cstdio>
#include <cmath>
#include <algorithm>
#include <vector>
#include <string>
#include <iostream>
#include <sstream>
#include <map>
#include <set>
#include <queue>
#include <stack>
#include <fstream>
#include <numeric>
#include <iomanip>
#include <bitset>
#include <list>
#include <stdexcept>
#include <functional>
#include <utility>
#include <ctime>
#include <valarray>
using namespace std;
typedef long long LL;
typedef unsigned long long ULL;
#define MEM(a,b) memset((a),(b),sizeof(a))
const LL INF = 1e9 + 7;
const int N = 1e5 + 10;
int main()
{
	//freopen("input.txt", "r", stdin);
	//freopen("output.txt", "w", stdout);
	int a, b, c, d, e;
	cin >> a >> b >> c >> d >> e;
	if (b == c)
	{
		puts("0");
		return 0;
	}
	int x = d;
	int ans = d;
	for (int i = 2; i <= (b - c) * a; i++)
	{
		if (i % 10 != 0) ans += x;
		else if (e > x) ans += x;
		else
		{
			x -= e;
			ans += x;
		}
	}
	cout << ans << endl;
	return 0;
}