#include<iostream> // cin\cout\endl #include<cstdio> //scanf()\printf() #include<cstring> // strcpy()\strcat()\strcmp()\strlen()\memset() #include<cmath> //sqrt()\pow()\abs()\ceil()\floor()\max()\min() using namespace std; int main(){ longlong a,c=0,v=1; cin>>a; while(a!=0){ c+=a%10*x; a/=10; x*=2; } ciot<<c; return 0; }