import java.math.*;
public class calculate {
	int p=0;
	int k=0;
	char str[];
	calculate(String s)
	{
        str=s.toCharArray();	
       // System.out.println(str);
    }
	
	
	int AddSub()             //加減法
	{
		int a1=MulDiv();
		
			while(str[p]=='+'||str[p]=='-')
		    {
			    int q=str[p];
			    p++;
	            int a2=MulDiv();
	            if(q=='+')
	                a1+=a2;
	            else
				    a1-=a2;
		    }
		 return a1;
	}


	int MulDiv()              //乘除法
	{
		int b1=Dat();
	    while(str[p]=='*'||str[p]=='/')
		{
			int q=str[p];
			p++;
	        int b2=Dat();
	        if(q=='*')
	            b1*=b2;
	        else 
	            b1/=b2;
		}
	    return b1;
	}

	int Dat()               //獲取整數
	{
		int c;		
		try{
			   c=atoi(str);
		    }
		catch(Exception e){
		     c=-1;
		     }
		if(p<str.length)
		{
        while((int)(str[p]-'0')>=0&&(int)(str[p]-'0')<=9)
        {       	
        	p++;
        }
		}
	    return c;
		
	}
	
	int atoi(char s[])          
	{
	    int total=0;
	    if(k!='#')
	    {
	       for(int i=k;i<s.length;i++)
	       {
	    	   int a=(int)(s[i]-'0');
	    	   if(a>=0&&a<=9)
	    	   {
	    		   total=total*10+a;
	    		   k++;	 	    		
	    	   }
	    	
	    	   else 
	    	       break;
	    	
	       }
	       k++;
	    }
	    return total;
	}
	
}