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- #include <iostream>
- #include <math.h>
- using namespace std;
- int main()
- {
- double n, i, s=0, a=1;
- cin >>n;
- for (i=1; i<=n; i++)
- {
- a=1.0/(i*i);
- s+=a;
- }
- cout<<s<<endl;
- return (0);}
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