n=int(input())
for i in range(2,n):
if(n%i==0):
print(str(i)+str(n//i))
break
#include <bits/stdc++.h>
using namespace std;
int main() {
int n ,k=2;
cin >> n;
while(n%k) {
k++;
}
cout<<k<<n/k;
}
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