#include<bits/stdc++.h>//头文件
using namespace std;
int a,b[205]={-20,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1};//0是不用考虑的,数据中没有0
int main(){
cin>>a;//输入a
cout<<b[a]<<endl;//输出相应的数
return 0;//结束
}