#include <stdio.h>
int max_of_four(int x, int z, int y, int w){
int max1 = x > z ? x : z;
int max2 = y > w ? y : w;
return max1 > max2 ? max1 : max2;
}
int main() {
int a, b, c, d;
scanf("%d %d %d %d", &a
, &b
, &c
, &d
); int ans = max_of_four(a, b, c, d);
}
//https://pt.stackoverflow.com/q/398525/101
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