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#include<fstream>
using namespace std;
int n, i,j;
int a[200], b[200], c[200];
ifstream fin("nunta.in");
ofstream fout("nunta.out");
void adunare(){
int m = max(a[0], b[0]);
int t = 0;
for(int i = 1; i <= m; i++){
c[i] = a[i] + b[i] + t;
t = c[i] / 10;
c[i] %= 10;
}
if(t != 0){
c[++m] = t;
}
c[0] = m;
}
int main(){
fin>> n;
if(n == 1){
fout<< 1;
return 0;
}
a[0] = a[1] = b[0] = b[1] = 1;
for(i = 1; i < n; i++){
adunare();
for(j = 0; j <= b[0]; j++){
a[j] = b[j];
}
for(j = 0; j <= c[0]; j++){
b[j] = c[j];
}
}
for(i = c[0]; i >= 1; i--){
fout<< c[i];
}
return 0;
}