#include <stdio.h>

constexpr int mod = 1e9 + 7;

/* 0 = not blue, 1 = blue */
int dyn[2][2];

int main()
{
	int n;
	scanf("%d", &n);

	dyn[1][0] = 2;
	dyn[1][1] = 0;

	for (int i = 2; i <= n; ++i)
	{
		dyn[i & 1][0] = (dyn[(i + 1) & 1][0] + dyn[(i + 1) & 1][1]) % mod;
		dyn[i & 1][1] = dyn[(i + 1) & 1][0];
	}

	printf("%d\n", dyn[n & 1][0]);
}