int main()
{
	char number[102]={0}; //?????number,??????????
	cin.getline(number,100,'\n'); //?????
	int lg=0; int num=0; //??????lg?????????????
	int an[100]={0}; //????an,????????????
	int left=(number[0]-'0'); //??????left????????????????
	int i=0,j=0; //?????
	int count=0; //????? 
	for(i=1;number[i]!=0;i++) //??????????
	{
		lg=left*10+(number[i]-'0'); //????????????????????
		an[j++]=lg/13; //???
		left=lg%13; //?????
		count++; //?????
	}
	if(count==0||(number[0]=='1'&&number[1]<'3'&&number[2]=='\0')) //????13?????0?
		cout<<"0"<<endl;
	else //??
	{
		if(an[0]!=0) //???????0?????
			cout<<an[0];
		for(i=1;i<count;i++) //???????
			cout<<an[i];
		cout<<endl; //???
	}
	cout<<left<<endl;//?????
	return 0; 
}