#include<stdio.h>
int main(){
int a[10], i, n, max=0;
scanf("%d", &n);
for(i=0; i<n; i++){
scanf("%d", &a[i]);
if(max<a[i]) max=a[i];
}
printf("%d", max^a[n-1]);
return 0;
}
April Fools Contest 2017, problem: (C) INTERCALC Solution in C
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