#include using namespace std; int ctoi(char &c){ switch(c){ case '1': return 1; case '2': return 2; case '3': return 3; case '4': return 4; case '5': return 5; case '6': return 6; case '7': return 7; case '8': return 8; case '9': return 9; default: return 0; } } int main() { string s; cin >> s; int sum = 0; for(int i = 0; i < s.size(); i++){ sum += ctoi(s.at(i)); } cout << sum << endl; }