Write a program that counts the number of common elements in 2 sorted arrays

#include <stdio.h>
#define MAXNUM 100

void main(void)
{
	int i, j, count=0, n1, n2, X[MAXNUM], Y[MAXNUM];

	do{
		printf("Enter the dimension of X: ");
		scanf("%d",&n1);
	}while(n1<=0 || n1>MAXNUM);
	printf("\nEnter the numbers in ascending order of X:\n");
	scanf("%d", &X[0]);
	for(i=1;i<n1;i++)
		do{
			scanf("%d", &X[i]);
		}while(X[i]<X[i-1]);


	do{
		printf("Enter the dimension of Y: ");
		scanf("%d",&n2);
	}while(n2<=0 || n2>MAXNUM);

	printf("\nEnter the numbers in ascending order of Y:\n");
	scanf("%d", &Y[0]);
	for(i=1;i<n2;i++)
		do{
			scanf("%d", &Y[i]);
		}while(Y[i]<Y[i-1]);

	i=0; j=0;
	while((i<n1)&&(j<n2))
	{
		/*if both elements are common*/
		if(X[i]==Y[j])
		{
			i++;
			j++;
			count++;
		}

		else/*advance the smaller*/
			(X[i]>Y[j])? j++: i++;
	}

	printf("\nNumber of common elements: %d\n", count);

 
}