#include<stdio.h>
int main()
{
int n,i,k,b,s1=0,s2;
long int a[100000];
scanf("%d%d",&n,&k);
for(i=0;i<n;i++)
{
scanf("%ld",&a[i]);
}
scanf("%d",&b);
for(i=0;i<n;i++)
{
s1=s1+a[i];
}
s2=s1-a[k];
if(s2/2==b)
{
printf("Bon Appetit\n");
}
else if(b>s2/2)
{
printf("%d",b-s2/2);
}
return 0;
}
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