#include<iostream>
#include<cstdio>
#include<bits/stdc++.h>
using namespace std;
int n,m,k,x,i,j,f,a,MINi,MINj;
int main(){
	cin>>n>>m>>a;
	if(n>m) x=1;
	for(i=n-(n%10),j=m-(m%10);i<=n+(10-n%10),j<=m+(10-m%10);i++,j++){
		if(x==1){
			for(k=2;k<m;k++){
				if(i%k==0&&i%k==0){
					i/=k;j/=k;
					f=1;
				}
			}
		}if(x==0){
			for(k=2;k<n;k++){
				if(n%k==0&&m%k==0){
					i/=k;j/=k;
					f=1;
				}
			}
		}if(f==0) break;
        else{ MINi=min(MINi,i);MINj=min(MINj,j);}
	}n=MINi;m=MINj;
    if(f==0&&n>a) cout<<n<<m;

}