omke

#include <bits/stdc++.h>

using namespace std;

int a, b;
int bLen;

int length(int x) {
    int result = 0;

    while (true) {
        result++;
        x /= 10;

        if (x == 0) {
            break;
        }
    }

    return result;
}

int getNthDigit(int x, int n) {
    for (; n > 0; n--) {
        x /= 10;
    }
    return x % 10;
}

int calculate(int len, int x, bool equalPrefix, bool first) {
    if (len == -1) {
        return 1;
    }

    int xDigit = getNthDigit(x, len);
    int bDigit = getNthDigit(b, len);

    if (equalPrefix) {
        int result = 0;
        for (int i = first; i <= bDigit && i + xDigit <= 9; i++) {
            result += calculate(len - 1, x, bDigit == i, false);
        }
        return result;
    }

    return (10 - xDigit - first) * calculate(len - 1, x, false, false);
}

int main() {
    cin >> a >> b;

    bLen = length(b);

    long long ans = 0;

    for (int x = 1; x <= a; x++) {
        for (int yLen = 1; yLen <= bLen; yLen++) {
            ans += calculate(yLen - 1, x, yLen == bLen, true);
        }
    }

    cout << ans << "\n";
    return 0;
}