#include<bits/stdc++.h> using namespace std; int main(){ int a=0,b=1,c; for (int i=0;i<=20;i++){ if (i==0){ cout<<a; } else if (i==1){ cout<<" "<<b; } else{ c=a+b; cout<<" "<<c; a=b; b=c; } } return 0; }