哪里错了啊

#include<bits/stdc++.h>
using namespace std;
int main(){	
	double m;
	cin>>m;
	int cnt=0;
	double a=0.00,b=0.00,c=0.00,d=0.00;
	for(a;a<=1.00;a+=0.01){
		for(b;b<=1.00;b+=0.01){
			for(c;c<=1.00;c+=0.01){
				for(d;d<=1.00;d+=0.01){
					if(fabs((1-a)*(1-b)*(1-c)*(1-d)-m)<1e-8) {
					cnt++;	
					}
				}
			}
		}
	}
	cout<<cnt;
	return 0;
}