#include <bits/stdc++.h>
using namespace std;
int find(int max, int life)
{
int even = 0, odd = 0;
//srand(time(0));
int k;
while(life--){
k = rand()%max;
if(k%2 ==0){
even++;
}
else{
odd++;
}
k = 0;
}
return odd;
}
int main() {
// your code goes here
int max, life;
cin>>max>>life;
cout<<find(max, life);
return 0;
}
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