
#include <bits/stdc++.h>
#define endl '\n'
#define buff ios::sync_with_stdio(false),cin.tie(nullptr),cout.tie(nullptr);
using namespace std;
typedef long long ll;
typedef pair<ll,ll> pll;
typedef vector<ll> vll;
typedef vector<pair<ll,ll>> vpll;
const ll MAX_INT=0x3f3f3f3f;
const ll MAX_LL=0x3f3f3f3f3f3f3f3f;
const ll CF=2e5+9;
const ll mod=1e9+7;
int a,b,h;
void solve()
{
cin >>a>>b>>h;
int now=0,cnt=0;
while (now<h)
{
cnt++;
now+=a;
if (now>=h)
{
cout <<cnt<<endl;
return;
}
now-=b;
}
}
int main()
{
ios::sync_with_stdio(0);cin.tie(NULL);cout.tie(NULL);
int T=1;
while (T--)
{
solve();
}
return 0;
}