# include <stdio.h>

int main()
{
	//½øÖÆת»»4£º´Ó¼üÅÌÊäÈëÒ»¸ö²»³¬¹ý8λµÄÕýµÄÊ®Áù½øÖÆÊý×Ö·û´®£¬
	//½«Ëüת»»ÎªÕýµÄÊ®½øÖÆÊýºóÊä³ö¡£
	int i=0,n=0;
	char a[10];
	unsigned long  sum=0;
	scanf("%s",a);
	n=strlen(a);
	for (i=0;i<n;i++)
	{  
		//×¢£ºasciiÂ룺A~65 0~48   //b=a[i];
		if (a[i]>='0'&&a[i]<='9')// ÊäÈëµÄÊý·¶Î§ÔÚ0~9
		{ 
			sum=sum*16;    sum=sum+a[i]-'0';
		} 
		if (a[i]>='A'&&a[i]<='F')// ÊäÈëµÄÊý·¶Î§ÔÚ10~15
		{
			sum=sum*16;
			sum=sum+a[i]-'A'+10;
		}
	} printf("%u",sum); //-----------------------------------------------------------*/
	return 0;}

/*Compiling...
½øÖÆת»¯.cpp
C:\Users\k40\Desktop\2014Äê4ÔÂ3ÈÕ\½øÖÆת»¯.cpp(11) : error C2065: 'strlen' : undeclared identifier
Error executing cl.exe.

½øÖÆת»¯.exe - 1 error(s), 0 warning(s)
*/