#include<iostream>
#include<string>
#include<algorithm>
#include<cctype>
#include<set>
#include<bitset>
#include<math.h>
#include<map>
#include<queue>
#include<iomanip>
using namespace std;

int main(){
    int a, b, c, d, m, min1, max1;
    cin >> a >> b >> c >> d >> m;
    min1 = a+c;
    max1 = b+d;
    if (((max1-min1) >= m-1) || (max1%m < min1%m)) cout << m-1 << endl;
    else cout << max1%m << endl;
}