#include <iostream>
    #include <conio.h>
    #include <fstream>

    using namespace std;
    float sum(float, float);
    float vid(float, float);
    float dob(float, float);
    float dil(float, float);

    int main(int argc, char *argv[])
    {
        float a, b;
        char diya;
        cin >> a >> diya >> b;
        if(diya=='+')
        {
            cout << sum(a, b);
        }
        else if(diya=='-')
        {
            cout << vid(a, b);
        }
        else if(diya=='*')
        {
            cout << dob(a, b);
        }
        else if(diya=='/')
        {
            cout << dil(a, b);
        }

    getch();
    return 0;
    }
    //===========================================
    float sum(float a1, float a2)
    {
        float s;
        s=a1+a2;
        return s;
    }

    float vid(float a3, float a4)
    {
        float v;
        v=a3-a4;
        return v;
    }

    float dob(float a5, float a6)
    {
        float d;
        d=a5*a6;
        return d;
    }

    float dil(float a7, float a8)
    {
        float di;
        di=a7/a8;
        return di;
    }