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#include <iostream> #include <iomanip> using namespace std; int main() { int n,m; double sum; while(1) { cin >> n; cin >> m; sum = 0; if(cin.eof()) { break; } for(int i = m+1 ; i < n+1 ; i++) { sum += 1.0/i; } cout << fixed << setprecision(10) << sum << endl; } return 0; }
