#include <iostream>
#include <vector>
#include <string>
#include <iostream>
#include <map>
using namespace std;
#define __THROW_ZERO do {cerr << "The dividend is 0" << endl; exit(1);}while(0);/*
简单工厂处理计算器问题*/enum op{ADD=0,SUB,MUL,DIV,
};class Operation{
protected:double _numA,_numB;
public:void set_num(double __A,double __B){_numA=__A;_numB=__B;}double get_numA(){return _numA;}double get_numB(){return _numB;}virtual double result()=0;
};class OperationAdd : public Operation{double result() override{return _numA+_numB;}
};class OperationDiv : public Operation{double result() override{if(0==_numB) __THROW_ZEROreturn _numA+_numB;}
};class OperationSub : public Operation{double result() override{return _numA-_numB;}
};class OperationMul : public Operation{double result() override{return _numA*_numB;}
};class OperationFactory{
public:static Operation *createOperate(op o){Operation *oper=nullptr;switch (o) {case ADD:oper = new OperationAdd();break;case SUB:oper = new OperationSub();break;case MUL:oper = new OperationMul();break;case DIV:oper = new OperationDiv();break;}return oper;}
};map<char,op> G_mp={{'+',ADD},{'-',SUB},{'*',MUL},{'/',DIV}};int main(int argc, char *argv[]) {int A,B;char char_op;while(1){cin>>A>>char_op>>B;auto oper= OperationFactory::createOperate(G_mp[char_op]);oper->set_num(A, B);cout<<oper->result()<<endl;}}