1 #include<cstdio> 2  3 #include<cstdlib> 4  5 #include<cmath> 6  7 #include<cstring> 8  9 #include<algorithm>10 11 #include<iostream>12 13 #include<vector>14 15 #include<map>16 17 #include<set>18 19 #include<queue>20 21 #include<string>22 23 #define inf 100000000024 25 #define maxn 200000+526 27 #define maxm 200000+528 29 #define eps 1e-1030 31 #define ll long long32 33 #define pa pair<int,int>34 35 #define for0(i,n) for(int i=0;i<=(n);i++)36 37 #define for1(i,n) for(int i=1;i<=(n);i++)38 39 #define for2(i,x,y) for(int i=(x);i<=(y);i++)40 41 #define for3(i,x,y) for(int i=(x);i>=(y);i--)42 43 #define for4(i,x) for(int i=head[x],y=e[i].go;i;i=e[i].next,y=e[i].go)44 45 #define for5(n,m) for(int i=1;i<=n;i++)for(int j=1;j<=m;j++)46 47 #define mod 100000000748 49 using namespace std;50 51 inline int read()52 53 {54 55     int x=0,f=1;char ch=getchar();56 57     while(ch<‘0‘||ch>‘9‘){if(ch==‘-‘)f=-1;ch=getchar();}58 59     while(ch>=‘0‘&&ch<=‘9‘){x=10*x+ch-‘0‘;ch=getchar();}60 61     return x*f;62 63 }64 65 int main()66 67 {68 69     freopen("input.txt","r",stdin);70 71     freopen("output.txt","w",stdout);72     ll a,b,h,k,cs=0;73 74     while(scanf("%lld%lld%lld%lld",&h,&a,&b,&k)!=EOF)75     {76         if(!h&&!a&&!b&&!k)break;77         bool flag=0;78         if((a-b)*(k-1)+a>2*b)flag=1;79         else if(a>=h)flag=1;80         else if((a-b)*(k-1)+a>=h)flag=1;81         else flag=0;82         printf("Case #%lld: %s\n",++cs,flag?"YES":"NO");83     }84 85     return 0;86 87 }