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Q11050.java
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Q11050.java
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package forRank;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.util.StringTokenizer;
public class Q11050 {
private static int fact[];
private static void fillFact(int N){
fact[0] = 1;
for (int i = 1; i <= N; i++) {
fact[i] = fact[i - 1] * i;
}
}
public static void main(String[] args) throws IOException {
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
StringTokenizer st = new StringTokenizer(br.readLine());
int N = Integer.parseInt(st.nextToken());
int K = Integer.parseInt(st.nextToken());
fact = new int[N + 1];
fillFact(N);
bw.write(String.format("%d\n", fact[N] / (fact[K] * fact[N - K])));
br.close();
bw.close();
}
}