import java.math.BigInteger;
import java.util.Scanner;
public class Main{
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
String str = sc.nextLine();
char[] a = str.toCharArray();
String l = "";
str = str.replace('+','z');
str = str.replace('-','z');
String[] arr = str.split("z");
for(int i = 0;i < a.length;i ++){
if(a[i]=='+'||a[i]=='-'){
l = l.concat(String.valueOf(a[i]));
}
}
char[] arrOfl = l.toCharArray();
BigInteger sum = BigInteger.ZERO;
sum = sum.add(new BigInteger(arr[0]));
for(int i = 1;i < arr.length;i ++){
if(arrOfl[i-1]=='+'){
sum = sum.add(new BigInteger(arr[i]));
}else{
sum = sum.subtract(new BigInteger(arr[i]));
}
}
System.out.println(sum);
}
}
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