#include<iostream>
using namespace std;
short int num(unsigned short int x, unsigned short int y)
{
short int c = 0;
if (y == 0)
c = -1;
else
c = x / y;
return c;
}
int main()
{
short int a, b;
cin >> a >> b;
cout << num(a, b) << endl;
return 0;
}
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