include < iostream>
using namespace std;
int main()
{int n;
cin > > n;
switch(n)
{case 1: cout< < "i"; break;
case 5: cout< < "v"; break;
case 10: cout< < "x"; break;
case 50: cout< < "l"; break;
case 100: cout< < "c"; break;
case 500: cout< < "d"; break;
case 1000: cout< < "m"; break;
}
return 0;
}