Codeforces 38A Army program in java

Army.java

import java.util.Scanner;
public class Army
{
	public static void main(String[] args)
	{
		Scanner z=new Scanner(System.in);
		int n=z.nextInt();
		int[] ar=new int[n-1];
		for(int i=0;i<ar.length;i++)
			ar[i]=z.nextInt();
		int a=z.nextInt();
		int b=z.nextInt();
		int temp=0;
		for(int i=a;i<b;i++)
			temp+=ar[i-1];
		System.out.println(temp);
	}
}