#include
Int main ()
{
Int I, n, m, t;
Double s=1;
The scanf (" % d ", & amp; N);
for(i=1; I<=n; I++)
{
For (m=1, t=1; m<=I; M++)
T=t * m;
S=s + 1.0/t;
}
Printf (" %. 10 lf ", s);
return 0;
}
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