#include
#include
#include
#include
#include
#include
#include
using namespace std;
#define REP(i,n) for(int i=0;i<(n);++i)
#define FOR(i,a,b) for(int i=(a);i<=(b);++i)
#define RFOR(i,a,b) for(int i=(a);i>=(b);--i)
typedef long long LL;
vector split( const string& s, const string& delim =" " ) {
vector res;
string t;
for ( int i = 0 ; i != s.size() ; i++ ) {
if ( delim.find( s[i] ) != string::npos ) {
if ( !t.empty() ) {
res.push_back( t );
t = "";
}
} else {
t += s[i];
}
}
if (!t.empty() ) {
res.push_back(t);
}
return res;
}
vector splitInt( const string& s, const string& delim =" " ) {
vector tok = split( s, delim );
vector res;
for ( int i = 0 ; i != tok.size(); i++ )
res.push_back( atoi( tok[i].c_str() ) );
return res;
}
int s2i(string s) {
stringstream ss;
ss << s;
int res;
ss >> res;
return res;
}
string i2s(int n) {
stringstream ss;
ss << n;
string res;
ss >> res;
return res;
}
void run() {
int res = 1; // m = 1
for (LL m = 2; m < 10; ++m) {
for (LL n = 1; ; ++n) {
LL a = (LL) (log10(m + 0.0) * n) + 1;
if (a < n) break;
if (a == n) {
++res;
//cout << "m = " << m << ", n = " << n << ",a = " << a << endl;
}
}
}
cout << res << endl;
}
int main() {
run();
}