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#include <vector>
#include <iostream>
using namespace std;

int max_subarray(const vector<int> &array, int t) {
	int n=array.size();
	
	int sum=0;
	for (int i=0;i<t;i++) sum+=array[i];
	
	int max=sum;
	for (int i=t;i<n;i++) {
		sum-=array[i-t],sum+=array[i];
		if (sum>max) max=sum;
	}
	
	return max;
}

int main() {
	int t,n;
	cin>>t>>n;
	
	vector<int> array(n);
	for (int i=0;i<n;i++) cin>>array[i];
	cout<<max_subarray(array, t)<<endl;
	
	return 0;
}

// https://paiza.jp/poh/enkoi-ending/fa81edcd

#include <iostream>
using namespace std;

int main() {
	int n,sum=0;
	cin>>n;
	while (n--) {
		int a,b,price;
		cin>>a>>b>>price;
		if (a>b) sum+=(a-b)*price;
	}
	cout<<sum<<endl;
	return 0;
}

// https://paiza.jp/poh/enkoi-third/0cd3b20d

#include <iostream>
using namespace std;

int main() {
	int n,x,sum=0;
	cin>>n;
	while (n--) {
		cin>>x;
		sum+=x;
	}
	cout<<sum<<endl;
	return 0;
}

// https://paiza.jp/poh/enkoi-second/9cb00b03