#include <stdio.h>
#include <stdint.h>
uint16_t binary_to_uint(const char *str) {
// Your logic here
uint16_t result = 0;
int i = 0;
while(str[i] != '\0'){
if(str[i] == '1'){
result = (result << 1) | 1;
}
else if(str[i] == '0'){
result <<= 1;
}
i++;
}
return result;
}
int main() {
char bin[20];
scanf("%s", bin);
printf("%u", binary_to_uint(bin));
return 0;
}