#include <cstdio>
int n,k,sum=0,mark;
int main()
{
scanf(“%d%d”,&n,&k);
for(int i=1;i<=n;i++)scanf(“%d”,&mark),sum+=mark;
mark=(n*k-sum)*2-n;
if(mark>0)printf(“%d”,mark);
else printf(“0”);
}
Codeforces Round #415 (Div. 2), problem: (A) Straight <> Solution In C/C++
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