#include <iostream>

using namespace std;

int main(int argc, char** argv)

{

int a, ch1, ch2, ch3, sum;

cout<<"Input a: ";

cin>>a;

ch1=a/100;

ch2=a%100/10;

ch3=a%10;

sum = ch1+ch2+ch3;

cout<<"Sum = "<<sum<<endl;

return 0;

}