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#include<bits/stdc++.h> using namespace std; int sum(int a,int b,int c){ if(c>1 && c<=9){ return c; } else{ return sum(a,b,c); } } int main(){ int n,m,s=0; cin>> n; // if(n>=0 && n<=9){ // cout<<n<<endl; // } /*else{*/ m=n%10; s=s+m; n=n/10; cout<< sum(n,m,s)<<endl; /*}*/ return 0; }
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