#include <iostream>
using namespace std;
int main()
{
int num;
int count = 0;
while(cin >> num){
count = 0;//每次输入一个数时,计数器重新清零。
if(num<1 || num>100){
return 0;
}
while(num > 3){
num = num-3;
num++;
count++;
}
if(num > 1)
{
count++;
}
cout<<count<<endl;
}
}
using namespace std;
int main()
{
int num;
int count = 0;
while(cin >> num){
count = 0;//每次输入一个数时,计数器重新清零。
if(num<1 || num>100){
return 0;
}
while(num > 3){
num = num-3;
num++;
count++;
}
if(num > 1)
{
count++;
}
cout<<count<<endl;
}
}