#include<iostream>
#include<string>
using namespace std;
int main(){
ios_base::sync_with_stdio(0) ;cin.tie(0) ;cout.tie(0);
string str = "codeforce" ;
int n;
cin>>n;
for(int i=0; i<str.size(); i++){
str[i] = tolower(str[i]);
}
if(n!=0 && n<= str.size()){
str[n-1] += 's';
}
for(int i=0;i<n;i++){
str[i] += str[n-1];
}
cout<<str<<endl;
return 0;
}
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