#include<bits/stdc++.h>
using namespace std;
long long n, k, m, ans;
int main()
{
	scanf("%lld%lld%lld", &n, &k, &m);
	ans = 0;
	while(n < m)
	{
		ans++;
		n = n + n * k;
	}
	printf("%lld\n", ans);
	return 0;
}

#include<bits/stdc++.h>
using namespace std;
long long n,k,m,ans;
int main()
{
	scanf("%lld%lld%lld",&n,&k,&m);
	ans=0;
	while(n<m)
	{
		ans++;
		n=n+n*k;
	}
	printf("%lld\n",ans);
	return 0;
}