#include<stdio.h>

int dectobin(int);

int dectobin(int num)
{
	if(!num)
		return 0;
	return (num%2)+dectobin(num/2)*10;
}

int main()
{
	int num;
	printf("Enter a number: ");
	scanf("%d", &num);
	printf("\nThe binary equivalent of %d is %d\n", num, dectobin(num));
	return 0;
}