#include<stdio.h>
int minturns(int n)
{
    if(n==0)
    return 0;
    if(n<0)
    return 100000;
    int a = minturns(n-1);
    int b = minturns(n-2);
    int c = minturns(n-3);
    int min=a;
    if(b<min)min=b;
    if(c<min) min=c;
    
}
int main()
{
    float input;
    scanf("%f",&input);
    if(inptut<0)
    {
        printf("Invalid Input");
        if(input<0)
    }
    int score = (int)input;
    printf("%d",minturns(score));
    return 0;
}