#include<bits/stdc++.h>
using namespace std;
class rectangle{
    private:
        int length,width;
    public:
        rectangle(int x,int y){
            length=x;
            width=y;
        }
        void set(int x,int y){
            length=x;
            width=y;
        }
        int area(){
            return length*width;
        }
};
class cuboid:public rectangle{
    private:
        int height;
    public:
        cuboid(int length,int width,int height):rectangle(length,width)
        {
            this->height=height;
        }
        int getvolume()
        {
            return height*rectangle::area();
        }
        
};
int main(){
    int x,y,z;
    cin>>x>>y>>z;
    cuboid a(x,y,z);
    cout<<a.getvolume();
    return 0;
}

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