#include <stdio.h>
int main()
{
int arr[4] = { 0 };
for (int i = 0; i < 4; i++)
{
scanf("%d", &arr[i]);
}
int max = arr[0];
for (int i = 1; i < 4; i++)
{
max = max > arr[i] ? max : arr[i];
}
printf("%d\n", max);
return 0;
} 
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