#include<stdio.h> int main() { int i,n; double sum=2,s,a[10],b[10]; scanf("%d",&n); a[0]=2;b[0]=1; if(n==1) { printf("%.6f",sum); } else { for(i=1;i<n;i++) { a[i]=a[i-1]+b[i-1]; b[i]=a[i-1]; s=a[i]/b[i]; sum+=s; } printf("%.6f",sum); return 0; } } |
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