Time limit exceeded in binary search

I have been working on a program to search an element using binary search but every time i run this program i get a time limit exceeded error. Though i searched about this error but I am unable to find what is the error in this program pls help Here is the code

#include<stdio.h>
int BinarySearch(int low,int high,int *a,int item);
int main(){
  int a[50] , i , low , high , n , item , position;

  printf("Enter the number of Elements");
  scanf("%i",&n);
  for(i=0;i<n;i++){
    scanf("%i",&a[i]);
  }

  printf("Enter the Element to be searched");
  scanf("%i",&item);
  low=0;
  high=n-1;
  position=BinarySearch(low,high,a,item);

  if(position==-1)
    printf("Item not found");
  else
    printf("item was found on the %i position",position);

  return 0;
}
int BinarySearch(int low,int high,int *a,int item){
  int mid,loc,flag=0;
  while (item!= a[mid] && low <= high);
  {
    mid = (low + high) / 2;

    if(a[mid]==item){
      loc=mid;
      flag=flag+1;
    }
    else if (item < a[mid])
      high = mid - 1;
    else
      low = mid + 1;
  }
  if (flag>=1)
    return loc;
  else
    return -1;
}