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  1. #include <cstdio>
  2.  
  3. int main() {
  4. 	long long n;
  5. 	scanf("%lld", &n);
  6. 	double res = (1.0 - 1.0 / (n * (n + 1) + 1)) / 2;
  7. 	printf("%.5lf\n", res);
  8. 	return 0;
  9. }
Success #stdin #stdout 0s 3144KB
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stdin
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1000
stdout
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0.50000
https://ideone.com/e4Fdky
language:
C++ (gcc 8.3)
created:
11 years ago
visibility:
secret

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