#include<bits/stdc++.h>
using namespace std;
 
#define debug(x) cerr << #x << ": " << (x) << endl
#define rep(i,a,b) for(int i=(a);i<=(b);i++)
#define dwn(i,a,b) for(int i=(a);i>=(b);i--)
#define pb push_back
#define all(x) (x).begin(), (x).end()
 
#define x first
#define y second
using pii = pair<int, int>;
using ll = long long;
 
inline void read(int &x){
    int s=0; x=1;
    char ch=getchar();
    while(ch<'0' || ch>'9') {if(ch=='-')x=-1;ch=getchar();}
    while(ch>='0' && ch<='9') s=(s<<3)+(s<<1)+ch-'0',ch=getchar();
    x*=s;
}

int n, k;

double cal(int sum, int del){
	return (double)(sum+del)/n;
}

signed main(){
	cin>>n>>k;
	int sum=0;
	rep(i, 1, k){
		int x; read(x);
		sum+=x;
	}
	cout<<cal(sum, (n-k)*-3)<<" "<<cal(sum, (n-k)*3)<<endl;
	return 0;
}