#include <stdio.h>
#include <string.h>

int toInt(char *s)
{
    int ret = 0, base = 1;
    int len;
    
    len = strlen(s);
    while (s[--len] >= '0')
    {
        ret += (s[len] - '0') * base;
        base *= 10;
    }

    if (s[0] == '-')
        ret *= -1;

    return (ret);
}

int main(int argc, char **argv)
{
    printf("%d\n", toInt(argv[1]));
}