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248B.cpp
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248B.cpp
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#include <iostream>
#include <cmath>
using namespace std;
int main(){
int digitsInput = 0;
int res = 100;
int i = 0;
cin >> digitsInput;
if(digitsInput <=2){
cout << "-1" << endl;
} else if (digitsInput == 3){
cout << "210" << endl;
} else {
for(i=0; i < digitsInput -3; i++){
res = res * 10;
res = res % 210;
}
res = 210 - res;
if(res < 100){
cout << "1";
for(i=0; i< digitsInput -3; i++){
cout << "0";
}
cout << res;
} else {
cout << "1";
for(i=0; i< digitsInput -4; i++){
cout << "0";
}
cout << res;
}
}
return 0;
}