#include <stdio.h>
#include <stdint.h>
int custom_atoi(const char *str) {
// Your logic here
int value =0;
bool negative = false;
if ( *str == '+')
{ str++; }
else if ( *str == '-')
{ str++; negative = true;}
while ( *str !='\0'){
if ( *str >= '0' && *str <= '9'){
value = value *10 + (*str - '0');
}
else break;
str++;
}
if ( negative ){
value =- value;
}
return value;
}
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;
}