#include <bits/stdc++.h>
using namespace std;

long long int gcd(long long int,long long int);

int main(){
	long long int T,A,B,C,a=0,b=0,t=0,temp,ans=0;
	cin >> T >> A >> B;
	ans+=(T+A-1)/A;
	ans+=(T+B-1)/B;
	temp=A;
	while(A>=10){A/=10;a++;}
	A=temp;
	temp=B;
	while(B>=10){B/=10;b++;}
	B=temp;
	temp=T;
	while(T>=10){T/=10;t++;}
	T=temp;
	if(a+b<=t){
		C=(A*B/(gcd(A,B)));
		ans-=(T+C-1)/C;
	}else{
		ans--;
	}
	cout << ans << endl;
	return 0;
}
long long int gcd(long long int a,long long int b){
	if(b==0){
		return a;
	}
	return gcd(b,a%b);
}