#include <cstdio>
#include <algorithm>

using namespace std;

//namaega184

int main(){
	int a,b,t;scanf("%d%d%d",&a,&b,&t);
	if(a>b)swap(a,b);
	/*int s=t/a;
	if(t%a==0)printf("%d\n",s);
	else */
	if(a==1){
		printf("%d\n",t);
		return 0;
	}
	int tmp=0,ans=1000000000;
	for(int i=0;i<t;i+=a){
		tmp=(t-i+b-1)/b;tmp*=b;
		if(ans>tmp+i)ans=tmp+i;
	}
	if(ans>(tmp=(t+a-1)/a*a))ans=tmp;
	printf("%d\n",ans);
	
	return 0;
}