/********************************************************************
@file     Main.cpp
@date     2017-06-01 12:17:46
@author   Zoro_Tiger
@brief    问题 1047: C语言程序设计教程（第三版）课后习题10.5
          http://www.dotcpp.com/oj/problem1047.html
********************************************************************/
#include <cstdio>

#define TEST
#undef  TEST

int main(int argc, const char* argv[])
{

#ifdef TEST
    freopen("in.txt", "r", stdin);
    freopen("out.txt", "w", stdout);
#endif

    int number_n = 0;
    scanf("%d", &number_n);

    int result = 0;
    for (int i = 2; i <= number_n; ++i)
    {
        result = (result + 3) % i;
    }
    printf("%d\n", result + 1);

    return 0;
}