#include<bits/stdc++.h>
 using namespace std;
#define INF 1000000000
#define REP(i,n) for(int (i)=0;(i)<(int)(n);(i)++)
int main(){
    long long A,B,C,D;
    cin>>A>>B>>C>>D;
    long long res1=A%D;
    long long res2=B%D;
    long long res3=C%D;
    long long res4=res1*res2;
    long long res5=res4%D;
    long long res6=res5*res3;
    long long res7=res6%D;
/*
    long long ans=A/D;
    ans+=B/D;
    ans+=C/D;
    ans+=res4/D;
    ans+=res6/D;
*/
    cout<<res7<<endl;
}