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- #include <iostream>
- using namespace std;
- int main(){
- int f1 = 1, f2 = 1;
- int n, f3;
- cin>>n;
- for(int i = 3; i <= n; i++){
- f3 = f1 + f2;
- f1 = f2;
- f2 = f3;
- }
- cout<<f3<<endl;
- return 0;
- }
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