#include <iostream>
using namespace std;
int main() {
    int a,b,c,d,m,ma,mi,ans;
    cin>>a>>b>>c>>d>>m;
    ma=(b+d)%m;
    mi=(a+c)%m;
    ans=max(ma,mi);
    if(ma>=mi) cout<<ans<<endl;
    else if(b+d>=m and a+c<=m)cout<<m-1<<endl;
    else cout<<ans<<endl;
        
return 0;
}