#include<stdio.h>
#include<stdlib.h>
void main(){
int i,k,n,m,*p,*a;
scanf("%d",&n);
a = (int *)malloc(sizeof(int)*n);
p = a;
for(i = 0;i < n;i++)
*(p + i) = i + 1;
k = m = i = 0;
while(m < n-1){
if(*(p + i))
k++;
if(k == 3){
*(p + i) = 0;
k = 0;
m++;
}
i++;
if(i == n)
i = 0;
}
while(*p == 0)
p++;
printf("%d\n",*p);
}