#include <iostream>
using namespace std;

int Recv(int x, int y, int max_X, int max_Y, int m){
    int answer = (x + y) % m;
    if(x < max_X){
        int value = Recv(x + 1, y, max_X, max_Y, m);
        if(value > answer){
            answer = value;
        }
    }
    if(y < max_Y){
        int value = Recv(x, y + 1, max_X, max_Y, m);
        if(value > answer){
            answer = value;
        }
    }

    return answer;
}

int main(){
    int a,b,c,d,m;
    cin >> a >> b >> c >> d >> m;

    cout << Recv( a, c, b, d, m) << '\n';

    return 0;
}