#include<stdio.h>
void main()
{
    float score;
    scanf("%f",&score);
    if(scor<0)
    {
        printf("Ivalid input");
    }
    int numscore=(int)score;
    int turns=numscore%3;
    int remainder= numscore%3;
    if(remainder !=0)
    {
      turns+=1;
    }
    printf("%d",turns);
    
}