from math import ceil
a, x, y = map(int, input().split())
l = y // a + ceil((y / a) % 1)
if ((l > 1 and l % 2 == 1) and (x == 0 or x >= a or x <= -a)) or (
(l == 1 or l % 2 == 0) and (x >= a / 2 or x <= -a / 2)) or y % a == 0:
print("-1")
exit(0)
if l == 1:
print("1")
exit(0)
if l % 2 == 0:
ans = 2 + (l / 2 - 1) * 3
else:
ans = 2 + ((l - 1) / 2 - 1) * 3
ans += 2 if x > 0 else 1
print(str(int(ans)))
#include<bits/stdc++.h>
using namespace std;
#define F first
#define S second
#define yes cout<<"YES"<<endl;
#define no cout<<"NO"<<endl;
#define t int t; scanf("%d",&t); while(t--)
typedef long long ll;
const ll mod = 1e9+7;
const ll inf = 1LL<<30;
const int N = 2e5+10;
map<int,int> mp1;
map<int,int>mp2;
vector<int>v;
set<int>ss;
int b[N];
int c[N];
int a[N];
int dfs=1e9+7;
int main()
{
int x,y,a,i=0;
bool f=1;
int cnt=0;
i=0;
f=1;
cin>>a>>x>>y;
if(y%a==0)
{
cout<<-1<<endl;
return 0;
}
if(a>y)
{
if(abs(2*x)<a)
cout<<1<<endl;
else cout<<-1<<endl;
return 0;
}
cnt=0;
y-=a;
while((i+a)<y)
{
i+=a;
if(f==1) cnt++;
else cnt+=2;
f=!f;
}
if(f==1) cnt++;
else cnt+=2;
if(f==1&&abs(2*x)<a)
cout<<cnt+1<<endl;
else if(f==0&&abs(x)<a&&x!=0)
cout<<cnt+1-(x<0)<<endl;
else cout<<-1<<endl;
}
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