#include <bits/stdc++.h>
using namespace std;
//#include <atcoder/all>
//using namespace atcoder;
using ll=long long;
using Graph=vector<vector<int>>;
#define MAX 1000000
#define MOD 1000000009
//#define MOD 998244353
#define INF 1000000000
//#define INF 1000000000000000000

int main(){
  ll a,b,c,d,k;
  cin>>a>>b>>c>>d>>k;
  ll ans=(a*b+c-d)%k;
  cout<<ans<<endl;

}