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#include<bits/stdc++.h>
using namespace std;
// Driver code
int main ()
{
int n = 10;
vector<int> f(n + 2);
f[0] = 0;
f[1] = 1;
for(int i = 2; i <= n; i++)
f[i] = f[i - 1] + f[i - 2];
cout << f[n];
return 0;
}