public class aVeryBigSum {
    static long aVeryBigSum(long[] ar) {
        long sum = 0;
        for(int i=0;i<ar.length;i++){
            sum+=ar[i];
        }
        return sum;
    }
    public static void main(String[]args){
        long[] ar = {1000000001,1000000002,1000000003,1000000004,1000000005}; //sample test case
        System.out.println(aVeryBigSum(ar));
    }
}