#include <bits/extc++.h>

int main() {
    using namespace std;
    unsigned long M, N;
    cin >> M >> N;
    unsigned long value{1}, ord_2{}, ord_5{};
    if(N > M - N)N = M - N;
    const auto multiplies{[&value, &ord_2, &ord_5](unsigned long x){
        while(x && x % 2 == 0){
            ++ord_2;
            x /= 2;
        }
        while(x && x % 5 == 0){
            ++ord_5;
            x /= 5;
        }
        (value *= x) %= 100000000;
    }};
    const auto divides{[&value, &ord_2, &ord_5](unsigned long x){
        while(x && x % 2 == 0){
            --ord_2;
            x /= 2;
        }
        while(x && x % 5 == 0){
            --ord_5;
            x /= 5;
        }
        (value *= [](unsigned long a, unsigned long n){
            unsigned long r{1};
            while(n){
                if(n & 1)(r *= a) %= 100000000;
                (a *= a) %= 100000000;
                n /= 2;
            }
            return r;
        }(x, 4999999)) %= 100000000;
    }};
    for(unsigned long i{}; i < N; ++i){
        multiplies(M - i);
        divides(i + 1);
    }
    assert(ord_2 < M && ord_5 < M);
    while(ord_2 > 0){
        --ord_2;
        (value *= 2) %= 100000000;
    }
    while(ord_5 > 0){
        --ord_5;
        (value *= 5) %= 100000000;
    }
    printf("%08lu\n", value);
    return 0;
}