#include <bits/stdc++.h> using namespace std; int main() { int n; cin>>n; int temp = 1; int number = n; if(n < 10) { cout<<n; return 0; } while(number >= 10) { temp = 1; while(number != 0) { if(number % 10 != 0) { temp *= number % 10; } number /= 10; } number = temp; } cout<<temp; return 0; }