#include
int main( )
{
float a,b,c;
char op;
scanf("%f%c%f",&a,&op,&b);
switch(op)
{
case'+':c=a+b;
case'-':c=a-b;
case'*':c=a*b;
case'/':c=a/b;
default:printf("error");
}
printf("result=%f",c);
return 0;
}