#include<stdio.h>
int main(){
int a=5,b=7,c=4,d=8;
//int b=7;
//int c=4;
//int d=8;
scanf("%d %d %d %d",&a,&b,&c,&d);
//scanf("%d",&b);
//scanf("%d",&c);
//scanf("%d",&d);
printf("%d\n",a+=a*b/c%d+++a|b);
return 0;
}