import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        int []a = new int[1000100];
        int []b = new int[1000100];
        for(int i=0;i<n;i++) {
            a[i] = sc.nextInt();
            b[i] = a[i];
        }
        for(int i=1;i<n;i++) b[i]+=b[i-1];
        while(sc.hasNextInt()){
            int l=sc.nextInt(),r = sc.nextInt();
            if(l==0) System.out.println(b[r]);
            else{
                int res = b[r]-b[l-1];
                System.out.println(res);
            }

        }
    }
}