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12 lines
247 B
12 lines
247 B
2 years ago
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#include <bits/stdc++.h>
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using namespace std;
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int main() {
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string number;
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cin >> number;
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int res = 0;
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for (int i = 0; i < number.size(); i++)
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if (number[i] == '1') res++;
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cout << res << endl;
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return 0;
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}
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