#include <iostream>
#include <cstdint>

using namespace std;

int main()
{
	cin.tie(nullptr);
	ios::sync_with_stdio(false);
	
	uint32_t a, b, c, d, k;
	cin >> a >> b >> c >> d >> k;

	cout << (static_cast<uint64_t>(a) * b + c - d) % k << '\n';
	return 0;
}