#include<stdio.h>
int main(void){
float a,b;
float c;
char operater;
scanf("%f%c%f",&a,&operater,&b);
switch (operater){
case '+' :
c=a+b;
break;
case '-' :
c=a-b;
break;
case '*' :
c=a*b;
break;
case '/' :
c=a/b;
break;
}
printf("%.3f\n",c);
return 0;
}