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

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