#include <cstdio>
#include <cmath>
#define rep( i, n, m ) for(ll i = ( n ); i < ( m ); i++)
using ll = long long int;

int give_water( int* array, int begin, int end );

int main( void ){
	int n;
	if (!scanf( "%d", &n ))
		return 0;
	if (n < 7){
		if (n < 3)
			printf( "%d\n", n );
		else
			printf( "%d\n", n - 1 );
		return 0;
	}
	int times = ( n - 6 ) / 2;
	ll array[] = {1, 2, 2};
	rep( i, 0, times ){
		int a = 0, b = 0, c = 0;
		a = array[ 1 ];
		b = array[ 1 ] + array[ 2 ];
		c = array[ 0 ] + array[ 2 ];
		array[ 0 ] = a%1000000007;
		array[ 1 ] = b%1000000007;
		array[ 2 ] = c%1000000007;
	}
	if (n % 2 != 0){
		array[ 2 ] *= 2;
	}
	ll sum = 0;
	rep( i, 0, 3 ){
		sum += array[ i ];
		sum %= 1000000007;
	}
	printf( "%d\n", sum );
	return 0;
}