#include "stdafx.h"
#include <windows.h>
#include <iostream.h>

int toPower2(int value){
	int rtnvle = 1;
	if(value > 1)
    for(int i=2;i<=value;i++){
        rtnvle *= 2;
	}
	return rtnvle;
}

int main(int argc, char* argv[])
{
	char binary_value[16];
	int  decimal = 0;

    cout<<"Type in a binary value 16 max(remember binary is right to left): ";
	cin>>binary_value;
	
    for(int i=strlen(binary_value) -1;i >= 0;i--){
		if(binary_value[i] == '1'){
			decimal += toPower2(strlen(binary_value) - i);
		} 
	     else if(binary_value[i] != '0')
		         return 0;
	}

    cout<<decimal<<endl;
	return 0;
}