#define _CRT_SECURE_NO_WARNINGS
#include <cstdio>
#include <cstring>
#include <cmath>
#include <vector>
#include <list>
#include <string>
#include <set>
#include <map>
#include <queue>
#include <stack>
#include <algorithm>
#include <iostream>
#include <sstream>
using namespace std;
typedef long long int llint;
const int INF = 1000000;
const llint LINF = 100000000;
using namespace std;
int main() {
	int n;
	cin >> n;
	cout << n - 1 << endl;
	return 0;
}