#include<stdio.h>
#include<conio.h>
int main() {
	int number, decimal_number, temp=1;
	printf("Enter any binary number= ");
	scanf("%d", &number);
    int remainder;
	while(number>0) {
	
		remainder = number%10;
		number = number/10;
		decimal_number += remainder*temp;
		temp = temp*2;//used as power of 2
	
	}
	printf("%d",decimal_number);
}