#include <stdio.h>
int max(int x, int y);
int main(void){
int a, b, c, d;
scanf("%d %d %d %d", &a
, &b
, &c
, &d
); printf("%d, %d, %d, %dの中で最大値は%dである", a
, b
, c
, d
, max
(max
(a
, b
), max
(c
,d
))); return 0;
}
int max(int x, int y)
{
return (x>y)?x:y;
}
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