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#include <iostream>

using namespace std;

const int MAXN = 1000000;

long long int fib[MAXN],N;

bool is_prime(long long int k){

for(int i=2; i*i<=k; i++){

if( k%i==0 ){

return false;

}

}

return true;

}

int main(){

cout<<"put the number"<<endl;

fib[0]=1;

fib[1]=1;

cin>>N;

for(int i=2; i<MAXN; i++){

fib[i] = fib[i-1]+fib[i-2];

}

for(int i=0; i<MAXN; i++){

if(fib[i]>N && is_prime( fib[i] ) ){

cout<<"ans is "<<fib[i]<<endl;

break;

}

}

return 0;

}