import java.io.IOException;
import java.nio.charset.Charset;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.*;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.stream.Stream;
public class z1 {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
String z = sc.next();
calcu c = new calcu();
System.out.println( c.cc(3,5,z,(a,b)->{
if(z.equals("+")){
return a+b;
} else if(z.equals("-")){
return a-b;
} else{
return 0;
}
}) );
}
}
class calcu{
public int cc(int a, int b, String z, cal c){
return c.operate(a,b);
}
}
interface cal{
public int operate(int a, int b);
}
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