// yukicoder: No.732 3PrimeCounting
// 2019.4.30 bal4u

#include <stdio.h>

#define MAX  300000
#define SQRT 547
char notPrime[MAX+2] = { 1,1,0,0,1 };	// zero: if prime
int ptbl[26000] = { 2 }; int sz;    // 25997

void sieve()
{
	int i, j, b;
	
	for (i = 3; i <= SQRT; i += 2) if (!notPrime[i]) {
		for (j = i * i; j <= MAX; j += i) notPrime[j] = 1;
	}
	sz = 1; for (i = 3; i <= MAX; i += 2) {
		if (!notPrime[i]) ptbl[sz++] = i;
	}
}

int f[300005];

int main()
{
	int N, i, j, a, b, c, d, t;
	long long ans;
	
	sieve();
	scanf("%d", &N);

	ans = 0;
	for (i = 3; (c = ptbl[i]) <= N; i++) {
		b = ptbl[i-1], t = ptbl[i-2] + b + c;
		a = i-2; while (a) f[ptbl[a--] + b]++;
		for (j = i+1; (d = ptbl[j]) <= t; j++) ans += f[d-c];
	}
	printf("%lld\n", ans);
	return 0;
}