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11 lines
229 B
C++
11 lines
229 B
C++
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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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double s, a, b;
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scanf("%lf%lf%lf", &s, &a, &b);
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printf("%.6lf\n", ((b + a) * s / (b + 3 * a)) / b + (s - ((b + a) * s / (b + 3 * a))) / a);
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return 0;
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}
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