#include <iostream>
#include <vector>
#include <cstring>

using namespace std;

int i = 0;

void add() {
    while (arr[i]){
        arr[i]--;
        i++;
        i++;
        arr[i]++;
        i++;
        arr[i]++;
        i--;
        i--;
        i--;
    }
    i++;
    while (arr[i]){
        arr[i]--;
        i++;
        arr[i]++;
        i++;
        i++;
        arr[i]++;
        i--;
        i--;
        i--;
    }
    i++;
    putchar(arr[i]);
    i++;
}

void multiply() {
    while (arr[i]) {
        arr[i]--;
        i++;
        i++;
        i++;
        i++;
        arr[i]++;
        i--;
        i--;
        i--;
        i--;
    }
    i++;
    i++;
    i++;
    i++;
    while (arr[i]) {
        arr[i]--;
        i--;
        i--;
        i--;
        add();
        i--;
        arr[i]++;
        i++;
        i++;
        i++;
    }
}

int main() {
    char arr[30000];
    memset(arr, 0, sizeof(arr));
    arr[i] = getchar();
    i++;
    arr[i] = getchar();
    i--;
}