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