View Code of Problem 69

#include <stdio.h>
int fun(int x){
  if(x<1)
    return x;
  else if(x<10)
    return 2*x-1;
    else 
      return 3*x-11;
}
int main(){
  int x;
  scanf("%d",&x);
  printf("%d\n",fun(x));
  
  
  
  
  return 0;
}