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

int Sum(vector<int>& row,int l,int r) {
	// your code goes here
	int sum=0;
	for(int i=l;i<r;i++) {
		sum+=row[i];
	}
	return sum;
}

int main() {
	vector<vector<int>> nums={{1,4,6,3,8,2},{3,5,1,9,7,4},{5,2,7,5,9,1}};
	
	int l=2,r=4;
	for(int i=0;i<nums.size();i++) {
		cout<<"Sum: "<<Sum(nums[i],l,r)<<endl;
	}
	return 0;
}