/* package whatever; // don't place package name! */
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.function.Function;
import java.util.stream.IntStream;
 
public class Main {
    public static void main(String[] args) throws Exception {
        int sum = 42;
        int read = 0;
        try (BufferedReader br = new BufferedReader(new InputStreamReader(System.in))) {
            Function<Integer, Integer> cont = IntStream.range(0, 3).mapToObj(i -> (Function<Integer, Integer>) x -> {
                try {
                    return x + Integer.parseInt(br.readLine());
                } catch (Exception e) {
                    throw new RuntimeException(e);
                }
            }).reduce(Function::andThen).get();
            System.out.println("res = " + cont.apply(0));
        }
    }
}
 

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