#include<iostream>
#include<string>

#define SIZE 250

using namespace std;

struct LongNumber {
    float digits[SIZE];
    float length;
};

int main() {
    LongNumber a, c;
    float delitel, length;

    string str, str1;

    for (int i = 0; i < SIZE; i++) {
        a.digits[i] = 0;
        c.digits[i] = 0;
    }

    cin >> str;
    for (int i = 0; i < str.length(); i++) {
        a.digits[SIZE - str.length() + i] = str[i] - '0';
    }

    cin >> delitel;

    int k = 0;
    for (int i = 0; i < SIZE; i++) {
        if (a.digits[i] == 0) {
            k++;
        }
        else break;
    }

    float ostatok = 0, ostatok2 = 0, b = 0, run = 0;
    float n;
    for (int i = k; i < SIZE; i++) {

        if (ostatok) {
            b = ostatok * 10 + a.digits[i];
            run = delitel;
            while (b >= run) {
                ostatok2++;
                run = run + delitel;
            }
            c.digits[i] = ostatok2;
            ostatok = b - (run - delitel);
            ostatok2 = 0;
        }
        else {
            if (ostatok == 0) {
                if (a.digits[i] < delitel) {
                    ostatok = a.digits[i];
                }
                else {
                    if (a.digits[i] >= delitel) {
                        b = a.digits[i];
                        run = delitel;
                        while (b >= run) {
                            ostatok2++;
                            run = run + delitel;
                        }
                        c.digits[i] = ostatok2;
                        ostatok = b - (run - delitel);
                        ostatok2 = 0;
                    }
                }
            }
        }
    }

    k = 0;
    for (int i = 0; i < SIZE; i++) {
        if (c.digits[i] == 0) {
            k++;
        }
        else break;
    }


    if (k == SIZE) {
        cout << '0';
    }
    else {
        for (int i = k; i < SIZE; i++) {
            cout << c.digits[i];
        }
    }

    return 0;

}