#include <iostream>
using namespace std;
double luasLayangLayang (int d1, int d2)
{
double luas;
luas = 0.5 * d1 * d2 ;
return luas;
}
int main() {
int d1, d2;
double luas;
cin >> d1 >> d2;
luas = luasLayangLayang (d1, d2);
cout<< "Luas Layang-Layang : " << luas;
return 0;
}
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