#include<iostream> using namespace std; int main() { int x,y; cin>>x; if(x<1) { y=x; cout<<y; return 0; } if(1<=x&&x<10) { y=2*x-1; cout<<y; return 0; } if(x>=10) { y=3*x-11; cout<<y; return 0; } return 0; }