import java.io.InputStream; import java.io.InputStreamReader; import java.io.IOException; import java.io.PrintWriter; import java.util.ArrayDeque; import java.util.ArrayList; import java.util.Arrays; import java.util.Comparator; import java.util.Deque; import java.util.HashMap; import java.util.InputMismatchException; import java.util.Map; import java.util.PriorityQueue; import java.math.BigInteger; public class Main{ static final InputStream in=System.in; static final PrintWriter out=new PrintWriter(System.out); static final int INF=Integer.MAX_VALUE/2; static final long LINF=Long.MAX_VALUE/2; public static void main(String[] args) throws IOException{ InputReader ir=new InputReader(in); String line=ir.next(); int res=0; int num=0; char c=' '; for(int i=0;i='0'&&line.charAt(i+1)<='9') c=line.charAt(i); if(line.charAt(i+1)=='-'){ if(line.charAt(i)=='+') c='-'; else c='+'; i++; } } else{ num=num*10+(int)(line.charAt(i)-'0'); if(i==line.length()-1){ if(c=='-') res+=num; if(c=='+') res-=num; } } } out.println(res); out.flush(); } static class InputReader { private InputStream in; private byte[] buffer=new byte[1024]; private int curbuf; private int lenbuf; public InputReader(InputStream in) {this.in=in;} public int readByte() { if(lenbuf==-1) throw new InputMismatchException(); if(curbuf>=lenbuf){ curbuf= 0; try{ lenbuf=in.read(buffer); } catch (IOException e) { throw new InputMismatchException(); } if(lenbuf<=0) return -1; } return buffer[curbuf++]; } public boolean isSpaceChar(int c){return !(c>=33&&c<=126);} private int skip() {int b; while((b = readByte())!=-1&&isSpaceChar(b)); return b;} public String next() { int b=skip(); StringBuilder sb=new StringBuilder(); while(!isSpaceChar(b)){ sb.appendCodePoint(b); b=readByte(); } return sb.toString(); } public int nextInt() { int c=readByte(); while (isSpaceChar(c)) c=readByte(); boolean minus=false; if (c=='-') { minus=true; c=readByte(); } int res=0; do{ if(c<'0'||c>'9') throw new InputMismatchException(); res=res*10+c-'0'; c=readByte(); }while(!isSpaceChar(c)); return (minus)?-res:res; } public long nextLong() { int c=readByte(); while (isSpaceChar(c)) c=readByte(); boolean minus=false; if (c=='-') { minus=true; c=readByte(); } long res = 0; do{ if(c<'0'||c>'9') throw new InputMismatchException(); res=res*10+c-'0'; c=readByte(); }while(!isSpaceChar(c)); return (minus)?-res:res; } public int[] toIntArray(int n){ int[] a=new int[n]; for(int i=0;i