C program to count all duplicate elements in the array

#include<stdio.h>
int main()
{
    int a[20],i,j,count=0,n;
    printf("enter the size of array:");
    scanf("%d",&n);
    printf("enter the array  element:");
    for(i=0;i<n;i++)
    {
        scanf("%d",&a[i]);
    }
    for(i=0;i<n;i++)
    {
        for(j=i+1;j<n;j++)
        {
          /* if duplicate found increment count by 1 */
            if(a[i]==a[j])
            {
              /* don't count next duplicate of current element */
              count++;
             break;
            }
        }
    }
    printf("\ntotal dublicate element are: %d",count);
    return 0;
}