#include <stdio.h> int main() { int m,i; long int a[90]; a[1]=1; a[2]=2; while(scanf("%d",&m)!=EOF && m!=0) { for(i=3;i<=m;i++) { a[i]=a[i-1]+a[i-2]; } printf("%ld\n",a[m]); } return 0; }
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