#include <stdio.h>
int main() {
/*int a,b,c,d;
scanf("%d %d %d %d",&a,&b,&c,&d);
int MAX =(a>b)?a:b;
MAX = (MAX > c)?MAX:c;
MAX = (MAX > d)?MAX:d;
printf("%d",MAX);*/
int arr[4];
int i =0;
while(i<4){
scanf("%d",&arr[i]);
i++;
}
int n =1;
int MAX = arr[0];
while(n<4){
if(arr[n]>MAX)
MAX = arr[n];
n++;
}
printf("%d",MAX);
return 0;
}

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