#include<stdio.h>
int main()
{
int n,k;
scanf(“%d%d”,&n,&k);
int a,i,m=0;
for(i=0;i<n;i++)
{
scanf(“%d”,&a);
if(a%k==0)
m+=a/k;
else
m+=a/k+1;
}
printf(“%d”,(m+1)/2);
return 0;
}
Codeforces Round #407 (Div. 2), problem: (A) Anastasia and pebbles Solution in C
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