Codeforces 435/A

#include<stdio.h>
int main()
{
    int p, n, m, bus, sum;
    while(scanf("%d %d", &n, &m)==2){
        sum=0;
        while(n--){
            scanf("%d", &p);
            sum+=p;
        }
        bus=sum/m;
        if(sum%m>0)
            bus+=1;
        printf("%d\n", bus);
    }
    return 0;
}