Program

#include<iostream>
using namespace std;
int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    int a,b;
    cin>>a>>b;
    cout<<((a*b)/2)<<'\n';
    return 0;
}

from math import prod
print(prod(list(map(int,input().split(' '))))//2)

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