"""
[4998: 저금](https://www.acmicpc.net/problem/4998)
Tier: Bronze 2
Category: 구현
"""
def solution(money, per, target):
ans = 0
while money < target:
ans += 1
money = money + (per / 100) * money
return ans
if __name__ == '__main__':
while 1:
try:
print(solution(*map(float, input().split())))
except:
break