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- #include <iostream>
- using namespace std;
- int main()
- {
- int x,s;
- cin>>x;
- while(x>9)
- {
- s=0;
- while(x!=0)
- {
- s=s+x%10;
- x=x/10;
- }
- x=s;
- }
- cout<<x;
- return 0;
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