import java.util.*;
class Ideone
{
static int sumOfDigits( int N ){
int sum = 0,mult =1;
while( N>0 ){
int digit = N%10;
sum = sum+digit*mult;
N = N/10;
mult= mult*2;
}return sum;
}
{
int result = sumOfDigits( 1010 );
}
}
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