>>440
#include<stdio.h>
#include<stdlib.h>

int main(){
char *s;
int count,i,n;
while(get(s)!EOF) count ++;
n=count-1;
for (i=0;i<n-1;i++){
sum=2^i*(*s);
s++;
};
printf("answer=%d",sum);
return 0;
}