#include <bits/stdc++.h>
using namespace std;
vector<int>prefixAdd(const vector<int>&b,int n){
	vector<int>p(n+1,0);
	for(int i=1;i<n;i++){
		p[i]=p[i-1]+b[i];
	}
	return p;
}
int range(int l,int r,vector<int>&finalans){
	int q=0;
	q=finalans[r]-finalans[l-1];
	return q;
}
int main() {
	// your code goes here
	vector<int>a={5,6,4,3,6};
	int n=a.size();
	int l;
	cin>>l;
	int r;
	cin>>r;
	vector<int>ansP=prefixAdd(a,n);
	int newans=range(l,r,ansP);
	cout<<"the sum in range is:"<<newans<<endl;
	return 0;
}

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