#include <stdio.h>

#define Num 10

int atoi(char s[]);

int main()

{

    int c,i = 0;

    char s[Num];

    int result;

    while((c = getchar()) != EOF && c != '\n' && i < Num)

    {

        s[i] = c;

        i++;

    }

    result = atoi(s);

        printf("%d\n",result);

        return 0;

}

int atoi(char s[])

{

    int i,n = 0;

    for(i = 0;s[i] >= '0' && s[i] <= '9';i++)

    {

        n = 10*n + (s[i] - '0');

    }

     return n;

}