#include<iostream> #include<algorithm> #include<cstring> #include<vector> using namespace std; #define rep(i,n) for(int i=0;i<(n);i++) const int INF=1<<25; int main() { int a,b,c,d,m; int ans = 0; cin >> a >> b >> c >> d >> m; for(int x = a;x<=b;x++)for(int y = c;y<=d;y++) { ans = max(ans, (x+y)%m); } cout << ans << endl; }