#include <iostream>
#include <cstdio>
#include <vector>
using namespace std;

int exp(int a, int b)
{
    int res = 1;
    while (b)
    {
        if (b & 1) res *= a;
        a *= a;
        b >>= 1;
    }
    return res;
}

int get(vector<int> &nums, int l, int r)
{
    int res = 0;
    for (int i = l; i >= r; --i) res = res * 10 + nums[i];
    return res;
}

int main()
{
    int n;
    scanf("%d", &n);
    vector<int> nums;
    while (n) nums.push_back(n%10), n /= 10;
    int res = 0;
    for (int i = nums.size()-1; i >= 0; --i)
    {
        if (i < nums.size()-1) res += get(nums, nums.size()-1, i+1) * exp(10, i);
        if (nums[i] > 1) res += exp(10, i);
        else if (nums[i] == 1) res += get(nums, i-1, 0) + 1;
    }
    printf("%d", res);
    return 0;
}