#include<stdio.h>
#include<stdlib.h>
#include<math.h>

int memo[11];

int minTurnsRecursive(int score){
    if (score <= 0){
        return 0;
    }
    if (memo[score] != -1){
        return memo[score];
    }
    
    int min_val = 1e9;
    if (score >= 1){
        int turns = minTurnsRecursive(score - 1);
        if (turns < min_val){
            min_val = turns;
        }
    }
    if (score >= 2){
        int turns = minTurnsRecursive(score - 2);
        if (turns < min_val){
            min_val = turns;
        }
    }
    if (score >= 3) {
        int turns = minTurnRecursive(score - 3);
        if (turns < min_val){
            min_val = turns;
        }
    }
    
    memo[score] = 1 + min_val;
    return memo[score];
}

int main() {
    float input_score_float;
    if (scanf("%f", &input_score_float) != 1) {
        printf("Invalid Input\n");
        return 0;
    }
    
    int input_score = (int)round(input_score_float);
    
    for (int i = 0; i <= 10; i++){
        memo[i] = -1;
    }
    
    if (input_score < 1 || input_score > 10){
}

int result = minTurnsRecursive(input_score);
printf("%d\n", result);

return 0;
}