#include<bits/stdc++.h>
#define re register
using namespace std;
inline int read(){
	re int t=0;re char v=getchar();
	while(v<'0')v=getchar();
	while(v>='0')t=(t<<3)+(t<<1)+v-48,v=getchar();
	return t;
}
const int M=998244353;
inline void add(re int &x,re int y){(x+=y)>=M?x-=M:x;}
inline int Mod(re int x){return x>=M?x-M:x;}
inline int ksm(re int x,re int y){
	re int s=1;
	while(y){
		if(y&1)s=1ll*s*x%M;
		x=1ll*x*x%M,y>>=1;
	}
	return s;
}
int t,n,m,a[1000002],ans,A,B,f[1000002],g[1000002],tp;
char s[1000002];
inline void Trans(re int x,re int y){
	if(y>n)return;
	int dlt=((y-1)-max(0,(x-1))-1)/B+1;
	if(f[x]+dlt+1<f[y])f[y]=f[x]+dlt+1,g[y]=0;
	int pos=max(0,x-1)+(dlt-1)*B;
	if(pos>y-B&&f[y]==f[x]+dlt+1)g[y]=max(g[y],pos);
	if(g[x]>x-B&&g[x]){
		dlt=((y-1)-g[x]-1)/B+1;
		if(f[x]-1+dlt+1<f[y])f[y]=f[x]-1+dlt+1,g[y]=0;
		int pos=g[x]+(dlt-1)*B;
		if(pos>y-B&&f[y]==f[x]-1+dlt+1)g[y]=max(g[y],pos);
	}
}
int main(){ans=1e9;
	A=read(),B=read(),n=read();
	if(A<B)swap(A,B);
	for(re int i=1;i<=n;++i)f[i]=1e9,g[i]=0;
	f[0]=0,g[0]=0;
	for(re int i=0;i<n;++i)Trans(i,i+A),Trans(i,i+A-1);
	for(re int i=1;i<=n;++i)
		if(i+A>n){
			if(g[i]>i-B)ans=min(ans,f[i]-1+(n-g[i])/B);
			ans=min(ans,f[i]+(n-(i-1))/B);
		}
	printf("%d",ans);
}