#define _USE_MATH_DEFINES
#include<iostream>
#include<cstdio>
#include<algorithm>
#include<climits>
#include<string>
#include<vector>
#include<list>
#include<map>
#include<set>
#include<cmath>
#include<queue>
#include<cstring>
#include<stack>
#include<functional>
#include<deque>
#include<cstdlib>
#include<ctime>
using namespace std;

typedef long long ll;

int main(){
	int N;
	cin >> N;
	printf("%d\n", N-1);
}