#include<stdio.h>
#include<ctype.h>

#define SIZE 10
#define BUFSIZE 100

char buf[BUFSIZE];
int bufp=0;

int getint(int *);
int getch(void);
void ungetch(int);

int main()
{
int i,n, array[SIZE];

for(n=0; n < SIZE && getint(&array[n]) != EOF; n++);
putchar(array[n]);
return 0;
}

int getint(int *pn)
{
 int c, sign;

 while(isspace(c=getch()));

 if(!isdigit(c) && c!=EOF && c!= '+' && c!='-')
  {
     ungetch(c);
     return 0;
  }

 sign = (c=='-') ? -1 : 1;
 if(c == '+' || c == '-')  c=getch();

  for(*pn=0; isdigit(c); c=getch())
   *pn = 10 * *pn + (c - '0');
 *pn *= sign;
 if ( c != EOF) ungetch(c);
 return c;
}


int getch(void)
 {
    return (bufp > 0) ? buf[--bufp] : getchar();
 }

void ungetch(int c)
 {
   if (bufp >= BUFSIZE) printf("ungetch: too many characters\n");
   else
     buf[bufp++]=c;
}