#include <cstdio>
#include <cstdlib>
#include <algorithm>
#include <map>


using namespace std;

int main(){
	int a,b,c;scanf("%d%d%d",&a,&b,&c);
	long long cm=(long long)a*b;if(a>b)swap(a,b);
	int ans=2*1000000000;
	if(cm>c){
		for(int i=0;i-b<=c;i+=b){
			int tmp=i+(c-i+a-1)/a*a;if(ans>tmp)ans=tmp;
		}
		printf("%d\n",ans);return 0;
	}
		
	int md=a;
	map<int,int> mp;
	if(c%b==0||c%a==0){ 
		printf("%d\n",c);return 0; 
	}
	for(int i=0;i-b<=c;i+=b){
		int tmp=i+(c-i+a-1)/a*a;
		int mc=(c-i);mc%=a;//if(mc<0)mc=-mc;
		if(mc){
			if(mp[mc]){ans=mp[md];printf("%d\n",ans);return 0;}
			else{mp[mc]=tmp;md=min(mc,md);}
		}
		else{
			printf("%d\n",ans=tmp);
			return 0;
		}
	}
	printf("%d\n",mp[md]);
	return 0;
	
}