#include <stdio.h>

int main(void) {
	int t, T = 5, g, G = 2, pg, PG = 3;
	int n, N;
	int a[101] = {0};
	scanf("%d", &N);
			for(pg = 0;pg <= N / PG;pg++){
	for(t = 0;t <= N / T;t++){
		for(g = 0;g <= t;g++){
				n = t * T + g * G + pg * PG;
				/*printf("n=%d\n",n);*/
				if(n <= N){
					a[n]++;
				}
			}
		}
	}
	printf("%d\n", a[N]);
	
	return 0;
}