#include <stdio.h>
void main() {
    float score;
    scanf("%f",&score);
    if(score<0)
    {
        printf("Invalid Input\n");
    }
    else
    {
        int intscore = (int)score;
        int turns = intscore / 3;
        int remainder = intscore % 3;
        if (remainder != 0)
    }
    turns +=1;
}
printf("%d\n", turns);
}
}