#include <iostream> using namespace std; int main(){ int n; double sum,t,fenzi,fenmu; while(scanf("%d",&n)!=EOF){ fenzi = 2; fenmu = 1; sum =0; for(int j=0;j<n;j++){ sum+=fenzi/fenmu; t = fenzi; fenzi = fenzi + fenmu; fenmu = t; } printf("%.6lf\n",sum); } } |
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