#include <stdio.h>
#include <stdint.h>
int custom_atoi(const char *str) {
// Your logic here
int num = 0;
bool neg = false;
while (*str != '\0') {
if (*str == '-') {neg = true; str++; continue;}
if (*str=='+') {str++; continue;}
if ((*str < '0')|| (*str > '9')) break;
num *= 10;
num += *str - '0';
str++;
}
return neg ? -num : num;
}
int main() {
char str[101];
fgets(str, sizeof(str), stdin);
// Remove newline
uint8_t i = 0;
while (str[i]) {
if (str[i] == '\n') {
str[i] = '\0';
break;
}
i++;
}
printf("%d", custom_atoi(str));
return 0;
}