#include<stdio.h> void main(){ int n,i,x1=2,x2=3,y1=1,y2=2,x,y; double sum=2/1.0+3/2.0; scanf("%d",&n); if(n==1) printf("%.2f",2/1.0); else if(n==2) printf("%.2f",2/1.0+3/2.0); else{ for(i=2;i<n;i++){ x=x1+x2; y=y1+y2; sum=sum+x/(y*1.0); x1=x2; x2=x; y1=y2; y2=y; } printf("%.2f",sum); } } |
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