#include <stdio.h>
#include <limits.h>
long long int A[200005];
int main(void){
long long int N,max=0,min=100000002,ans;
scanf("%lld",&N);
for(int i=0;i<=N;i++){
scanf("%lld",&A[i]);
if(A[i]>max){
max=A[i];
}
else if(A[i]<min){
min=A[i];
}
}
ans=2*(max-min);
printf("%lld\n",ans);
return 0;
}
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