#include <stdio.h>
#include <stdlib.h>
int max(int a, int b) {
if (a > b) {
return a;
}
return b;
}
int main()
{
int a, b, c, d = 0;
scanf("%d %d %d %d", &a
, &b
, &c
, &d
); printf("%d", max
(a
, max
(b
, max
(c
, d
)))); return 0;
}
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