#include <stdio.h>

#define NWORDS 33

char *words[NWORDS]=
{
	"negative",
	"zero",
	"one",
	"two",
	"three",
	"four",
	"five",
	"six",
	"seven",
	"eight",
	"nine",
	"ten",
	"eleven",
	"twelve",
	"thirteen",
	"fourteen",
	"fifteen",
	"sixteen",
	"seventeen",
	"eighteen",
	"nineteen",
	"twenty",
	"thirty",
	"forty",
	"fifty",
	"sixty",
	"seventy",
	"eighty",
	"ninety",
	"hundred",
	"thousand",
	"million",
	""
};

int val[NWORDS]=
{0,  0,1,2,3,4,5,6,7,8,9,10,
 11,12,13,14,15,16,17,18,19,
20,30,40,50,60,70,80,90,0,0,0,0};

char * getword(char * s,char ** w)
{
	while(s[0]&&(s[0]==' '))s++;
	*w=s;
	while(s[0]&&(s[0]!=' '))s++;
	if(s[0])
	{
		s[0]=0;
		return s+1;
	}else return s;
}

int getwr(char ** s)
{
	int i;
	char * w;
	*s=getword(*s,&w);
	for(i=0;i<NWORDS;i++)if(!strcmp(w,words[i]))return i;
}

int parse(char * s)
{
	int m=1,v=0,d=0,w;
	char * S=s;
	while((w=getwr(&S))!=32)
	{
		if(w==0)
		{
			m=-1;
		}
		else if((w>=1)&&(w<=28))
		{
			d+=val[w];
		}
		else if(w==29)
		{
			d*=100;
		}
		else if(w==30)
		{
			v+=d*1000;
			d=0;
		}
		else if(w==31)
		{
			v+=d*1000000;
			d=0;
		}
	}
	v+=d;
	return m*v;
}

int main()
{
	char Line[100000];
	while((scanf("%[^\n]\n",Line))==1)
	{
		printf("%d\n",parse(Line));
	}
	return 0;
}