#include <stdio.h>
#include <stdlib.h>
typedef signed long long int bint;
bint aVeryBigSum(int *arr,int index)
{
    bint sum=0;
    for(int i=0;i<index;i++)
    {
        sum=sum+arr[i];
    }
    return sum;
}
int main(void)
{
    bint sum;
    int size;
    printf("Enter the size of the array.\n");
    scanf("%d",&size);
    int *arr=malloc(size*sizeof(int));
    printf("size is %d.\n",size);
    if(arr==NULL)
    {
        fprintf(stderr,"Error: malloc returns NULL for arr.\n");
        exit(EXIT_FAILURE);
    }
    printf("Enter %d integers, separated by spaces.\n",size);
    for(int i=0;i<size;i++)
    {
        scanf("%d",&arr[i]);
    }
    sum=aVeryBigSum(arr,size);
    printf("Sum is %lld.\n",sum);
    return 0;
}