#include <iostream>
#include <string.h>
#include <stdlib.h>
using namespace std
;
int main()
{
char s
[10];
cin
>> s
;
int sum
= 0;
for(int i
= 0;i
< strlen(s
);i
++){
sum
+= s
[i
] - '0';
}
cout
<< sum
<< endl
;
return 0;
}
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