#include <iostream>

// 计算一个数的各位数字之和
int digitSum(int num) {
    int sum = 0;
    while (num > 0) {
        sum += num % 10;
        num /= 10;
    }
    return sum;
}

int main() {
    int n;
    std::cin >> n;
    int count = 0;
    // 遍历 1 到 n 的所有数
    for (int i = 1; i <= n; ++i) {
        if (digitSum(i) == 13) {
            ++count;
        }
    }
    std::cout << count << std::endl;
    return 0;
}    
/**************************************************************
	Problem: 1511
	User: panyuchen
	Language: C++
	Result: Accepted
	Time:102 ms
	Memory:2072 kb
****************************************************************/