package main

import "fmt"

func main() {
	var n int
	fmt.Scan(&n)
	a := []rune{}
	x := "CMSRo."
	y := []int{720,360,180,30,6,1}
	for i,c := range x {
		for p:=y[i]; n>=p; n-=p {
			a = append(a,c)
		}
	}
	fmt.Println(string(a))
}