import java.util.*;
import java.util.function.*;
import java.util.regex.*;

public class TestLambda {

 private int i;

 private void add(final String s) {
  i+=Integer.parseInt(s);
 }

 private void sub(final String s) {
  i-=Integer.parseInt(s);
 }

 private void print() {
  System.out.println(i);
 }

 public static class ParamHolder {
  public final TestLambda th;
  public final Matcher m;
  public ParamHolder(final TestLambda th,final Matcher m){
   this.th=th;
   this.m=m;
  }
 }

 public static class FuncHolder {
  public final Pattern pattern;
  public final Consumer<ParamHolder> func;
  public FuncHolder(final Pattern pat,final Consumer<ParamHolder> func){
   this.pattern=pat;
   this.func=func;
  }
 }

 private static final List<FuncHolder> DEEDS_MAP= new ArrayList<FuncHolder>();

 static {
  DEEDS_MAP.add(new FuncHolder(Pattern.compile("\\+\\s+([0-9]+)"), (t) -> t.th.add(t.m.group(1))));
  DEEDS_MAP.add(new FuncHolder(Pattern.compile("добавь\\s+([0-9]+)"), (t) -> t.th.add(t.m.group(1))));
  DEEDS_MAP.add(new FuncHolder(Pattern.compile("\\-\\s+([0-9]+)"), (t) -> t.th.sub(t.m.group(1))));
  DEEDS_MAP.add(new FuncHolder(Pattern.compile("вычти\\s+([0-9]+)"), (t) -> t.th.sub(t.m.group(1))));
  DEEDS_MAP.add(new FuncHolder(Pattern.compile("\\="), (t) -> t.th.print()));
 }

 public void doSomething(String o) {
  final int l = DEEDS_MAP.size();
  for (int i =0;i<l;i++) {
   final FuncHolder h = DEEDS_MAP.get(i);
   final Matcher m = h.pattern.matcher(o);
   if (m.matches()) h.func.accept(new ParamHolder(this,m));
  }
 }

 public static void main(String[] args) {
  TestLambda tl = new TestLambda();
  for (String s : args)
   tl.doSomething(s);
 }
}