#include <stdio.h> int main() { int n; scanf("%d",&n); int i,x,y; double sum=2; x=2; y=1; if(n>=1&&n<=10) { for(i=2; i<=n; i++) { int tmp=y; y=x; x=tmp+x; sum=sum+(x*1.0)/y; } printf("%.6f",sum); } return 0; } |
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