Each coupon is half the rate
It's worked out on the face value. The price doesn't change it.
Gross coupon = face value × annual rate ÷ 2. With 100,000 Kz of face value at 17.25%, you get 8,625 Kz gross. IAC takes 862.50 Kz and 7,762.50 Kz reaches you.
If the technical sheet counts the exact days in each half-year, the amount can differ slightly. If the date falls on a weekend or public holiday, check with your broker when the money arrives.