#include #include #include using namespace atcoder; using mint = modint998244353; using namespace std; #define rep(i,n) for (int i = 0; i < (n); ++i) #define Inf32 1000000000 #define Inf64 1000000000000000001LL int main(){ long long n; cin>>n; long long t = n; long long phi = n; for(long long i=2;i*i<=t;i++){ if(t%i==0){ phi /= i; phi *= i-1; while(t%i==0)t/=i; } } if(t>=2){ phi /= t; phi *= t-1; } n *= 3; string s = to_string(n); s = string(s.rbegin(),s.rend()) + s; cout<<2<