#include
  #include
 void main()
 {
 clrscr();
 int i;float number[100],sump,sumn,total;char ch[100];
 for( i=1;i<=100;i++)
 {
 if(i%2==1)
 scanf("%c",&ch[i]);
 else
 scanf("%d",&number[i]);
  if(ch[i]=='=')
  i=1000;
 }
 for( i=1;i<=100;i+=2)
 {
 if(ch[i]=='+')
 sump=sump+number[i+1];
if(ch[i]=='-')
 sumn=sumn+number[i+1];
 }
 total=sump-sumn;
 printf("%f",total);
// printf("hhhhh");
  getchar();
  }
 
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