View Code of Problem 69

#include<iostream>
#include <stdio.h>
#include <string.h>
using namespace std;


int main() {
	int x;
	scanf("%d", &x);
	int a, b, c, y;
	if (x < 1)
		y = x;
	else if (1 <= x && x < 10)
		y = 2 * x - 1;
	else
		y = 3 * x - 11;
	printf("%d", y);
	return 0;
}