#include<bits/stdc++.h>
//#define int long long
#define ll long long
#define ull unsigned long long
#define ld long double
#define PII pair<int,int>
#define INF 0x3f3f3f3f
#define INFLL 0x3f3f3f3f3f3f3f3f
#define chkmax(a,b) a=max(a,b)
#define chkmin(a,b) a=min(a,b)
#define rep(k,l,r) for(int k=l;k<=r;++k)
#define per(k,r,l) for(int k=r;k>=l;--k)
#define cl(f,x) memset(f,x,sizeof(f))
using namespace std;
void file_IO() {
	freopen(".in","r",stdin);
	freopen(".out","w",stdout);
}
const int N=1e6+5;
int f[N],n,a,b;
int solve(int x,int y) {
	if(x>n&&y>n)
		return 0;
	if(x<y)
		return solve(x+a,y)+1;
	if(x>y)
		return solve(x,y+b)+1;
	if(f[x]!=-1)
		return f[x];
	return f[x]=min(solve(x-1,y),solve(x,y-1));
}
void solve() {
	scanf("%d%d%d",&a,&b,&n);
	cl(f,-1);
	printf("%d\n",solve(a,b));
}
signed main() {
	//file_IO();
	int testcase=1;
	//scanf("%d",&testcase);
	while(testcase--)
		solve();
	return 0;
}