#include<stdio.h> main() { int m,i; int a[90]; a[0]=1; a[1]=2; while(1) { scanf("%d",&m); if(m==0)break; else{ for(i=2;i<m;i++) a[i]=a[i-1]+a[i-2]; } printf("%d\n",a[m-1]); } return 0; }
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