#include #include #include #include #include #include #include #include #include #include #include #include #pragma warning(disable:4996) typedef long long ll; #define MIN(a, b) ((a)>(b)? (b): (a)) #define MAX(a, b) ((a)<(b)? (b): (a)) #define LINF 9223300000000000000 #define INF 2140000000 #define MOD 1000000007 using namespace std; int main(int argc, char* argv[]) { ll n; scanf("%lld", &n); printf("%lld\n", 2*n-1); return 0; }