#include <fstream>
using namespace std;

ifstream f("ciur.in");
ofstream g("ciur.out");

int n,x,v[2000000],i,t,y=1,p,r;

int main()
{f>>n;
for(i=1;i<=n-1;i++)
v[i]=i+1;

x=2;
t=2;
p=n-1;

while(t<p)
{r=t;
for(i=t;i<=p;i++)
{if(v[i]%x!=0)
{v[r]=v[i];
r++;}
}

p=r-1;
t++;
x=v[t-1];
}

g<<t;

    return 0;
}