#include <stdio.h>
 
int main()
{
    int arr[] = {1, 2, 2, 3, 3, 3, 4, 4, 4, 4};
    int first, last, start, end, mid, x;
 
    scanf("%d", &x);
 
    start = 0;
    end = 9;
    first = last = -1;
    while (start <= end) {
        mid = start + (end - start) / 2;
        if (arr[mid] == x) {
        	first = mid;
        	end = mid - 1;
        } else if (arr[mid] <= x) {
        	start = mid + 1;
        } else {
        	end = mid - 1;
        }
    }
 
    start = 0;
    end = 9;
	while (start <= end) {
		mid = start + (end - start) / 2;
		if (arr[mid] == x) {
			last = mid;
			start = mid + 1;
		} else if (arr[mid] < x){
			start = mid + 1;
		} else {
			end = mid - 1;
		}
	}
 
 
    if (last != -1) 
    	printf("The number of occurance is %d\n", last - first + 1);
 	else
 		printf("The number of occurance is 0\n");
    return 0;
}