Mowing the Field

**Description:** A lawn is 1 cm tall. Each day it grows by g cm; each evening a mower cuts it back to h cm (only if it is taller than h). After how many full days is the lawn taller than T cm for the first time? Print the day number, or -1 if it never happens within 10^6 days. **Input:** One line: g h T (0 ≤ g ≤ 10, 0 ≤ h ≤ 10, 1 ≤ T ≤ 10^9). **Output:** One integer — the first day the height exceeds T, else -1. **Example:** 2 1 4 → day1: 1+2=3 (cut to 1), day2: 1+2=3… never exceeds 4 → -1. With 3 1 4: day1: 4 (not > 4? cut), day2: 4… -1. With 4 1 4: day1: 1+4=5 > 4 → 1.