import java.io.*;
import java.util.*;
import java.util.stream.*;

// 処理
final class Process {
    private final String S;
    
    Process(final String S) {
        this.S = S;
    }

    // 結果を出力
    final void printResult(final PrintWriter printWriter) throws IOException {
        final int[] numbers = Stream.of(S.split("/")).mapToInt(Integer::parseInt).toArray();
        final int correctCount  = numbers[0];
        final int questionCount = numbers[1];

        printWriter.println((double)correctCount / questionCount);
    }
}

public class Main {
    public static void main(final String[] args) throws IOException {
        final BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(System.in));
        final PrintWriter    printWriter    = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));
        
        // 入力
        final String S = bufferedReader.readLine().trim();
        
        // Process クラスで処理を行う
        final Process process = new Process(S);
        process.printResult(printWriter);
        
        // 各ストリームを閉じる
        // 出力ストリームを閉じるときに標準出力に文字を出力する
        bufferedReader.close();
        printWriter.close();
    }
}