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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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int n;
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string s;
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cin >> n >> s;
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unsigned long long ans = 0;
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for (int i = 0; i < n; i++)
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if (((s[i] - '0') & 1) ^ 1)
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ans += i + 1;
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cout << ans << endl;
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return 0;
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} |
