#include <stdio.h>

 #include <string.h>

 struct trans{

     char eng[];

     int num;

 }s[];

 int main(){

 //    freopen("in.txt","r",stdin);

     strcpy(s[].eng,"zero"),      s[].num = ;

     strcpy(s[].eng,"one"),       s[].num = ;

     strcpy(s[].eng,"two"),       s[].num = ;

     strcpy(s[].eng,"three"),     s[].num = ;

     strcpy(s[].eng,"four"),      s[].num = ;

     strcpy(s[].eng,"five"),      s[].num = ;

     strcpy(s[].eng,"six"),       s[].num = ;

     strcpy(s[].eng,"seven"),     s[].num = ;

     strcpy(s[].eng,"eight"),     s[].num = ;

     strcpy(s[].eng,"nine"),      s[].num = ;

     strcpy(s[].eng,"ten"),      s[].num= ;

     strcpy(s[].eng,"eleven"),   s[].num= ;

     strcpy(s[].eng,"twelve"),   s[].num= ;

     strcpy(s[].eng,"thirteen"), s[].num= ;

     strcpy(s[].eng,"fourteen"), s[].num= ;

     strcpy(s[].eng,"fifteen"),  s[].num= ;

     strcpy(s[].eng,"sixteen"),  s[].num= ;

     strcpy(s[].eng,"seventeen"),s[].num= ;

     strcpy(s[].eng,"eighteen"), s[].num= ;

     strcpy(s[].eng,"nineteen"), s[].num= ;

     strcpy(s[].eng,"twenty"),   s[].num= ;

     strcpy(s[].eng,"thirty"),   s[].num= ;

     strcpy(s[].eng,"forty"),    s[].num= ;

     strcpy(s[].eng,"fifty"),    s[].num= ;

     strcpy(s[].eng,"sixty"),    s[].num= ;

     strcpy(s[].eng,"seventy"),  s[].num= ;

     strcpy(s[].eng,"eighty"),    s[].num= ;

     strcpy(s[].eng,"ninety" ),   s[].num= ;

     strcpy(s[].eng,"hundred"),  s[].num= ;

     strcpy(s[].eng,"thousand"), s[].num= ;

     strcpy(s[].eng,"million"),  s[].num= ;

     strcpy(s[].eng,"negative"); s[].num= -;

     char a[];

     while(gets(a))

     {

         if(strlen(a)==) break;

         char tmp[]={};

         int ans=,flog=,sum=,x=;

         int len=strlen(a);

         for(int i=,k=;i<len;i++)

         {

             if(a[i]!=' ') tmp[k++]=a[i];

             if(a[i]==' '||i==len-){

                 k=;

                 flog=;

                 for(int m=;m<=;m++){

                     if(strcmp(s[m].eng,tmp)==){

                             if(m==) {

                                 x=-;

                                 continue;

                             }

                             if(m<=) sum+=s[m].num;

                             if(m==) sum*=s[m].num;

                             if(m>=) {

                                 ans+=sum*s[m].num;

                                 sum=;

                             }

                             break;

                     }

                 }

             }

             if(flog==){

                 memset(tmp,,sizeof(tmp));

                 flog=;

             }

         }

         printf("%d\n",(ans+sum)*x);

     }

     return ;

 }