#include<bits/stdc++.h>
using namespace std;
int main(){
    int a,b;
    char f;
    cin>>a>>b>>f;
    if(f=='+'){
        cout<<a+b;
    }
    else if(f=='-'){
        cout<<a-b;
    }
    else if(f=='*'){
        cout<<a*b;
    }
    else if(f=='/'){
        if(b==0){
            cout<<"Divided by zero!";
        }
        else{
            cout<<a/b;
        }
    }
    else{
        cout<<"Invalid operator!";
    }
    return 0;
}

#include #include #include using namespace std;

int main() { double x1, y1, x2, y2, x3, y3; cin >> x1 >> y1 >> x2 >> y2 >> x3 >> y3;

double area = 0.5 * abs((x1*(y2-y3) + x2*(y3-y1) + x3*(y1-y2)));

cout << fixed << setprecision(2) << area << endl;
return 0;

}