#include<bits/stdc++.h>
using namespace std;
int a,b,d,e,sum;
double c;
int main(){
	cin>>a>>b;
	for(int i=1;i<=a;i++){
		cin>>d;
		sum+=d;
	}
	e=sum/b;
	c=((double)sum/(double)b);
	if(c>e){
		cout<<e+1;
	}else{
		cout<<e;
	}
	return 0;
}