#include <stdio.h> #include <string.h> int main() { int n ,k; double sum=0; scanf("%d",&n); for(k=0;k<n;k++) { double a,b,c,d,e,f,g,h,i,j; a=2.0/1; b=3.0/2; c=5.0/3; d=8.0/5; e=13.0/8; f=21.0/13; g=34.0/21; h=55.0/34; i=89.0/55; j=144.0/89; double num[10]={a,b,c,d,e,f,g,h,i,j}; sum=sum+num[k]; } printf("%.6lf\n",sum ); return 0; } |
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