#include <iostream>
#include <vector>
#include <string>
#include <cstring>
#include <algorithm>
#include <sstream>
#include <map>
#include <set>
using namespace std;


#define REP(i,a,b) for(i=a;i<b;i++)
#define rep(i,n) REP(i,0,n)

typedef long long ll;
typedef unsigned long long ull;
typedef long double lb;
/* ここからが本編 */


int main(void)
{
   int i,j,k,l;
   int n;
   int a[4];
   int b[10] = {0};
   char s[5];
   cin >> n;
   cout << n-1 <<endl;

   return 0;
}