#include<queue> 
#include<cstdio>
#include<cstring>
#include<iostream>
#include<algorithm>
using namespace std;
int n,m,s,f;
int vis[102][102][102];
void bfs(){
    memset(vis,0,sizeof(vis));
    queue<int>que1,que2,que3,step;
    que1.push(0);que2.push(s);
    que3.push(0);step.push(0);
    vis[0][s][0]=1;
    while(!que1.empty()){
        int now1=que1.front();que1.pop();
        int now2=que2.front();que2.pop();
        int now3=que3.front();que3.pop();
        int nows=step.front();step.pop();
        if(now1==s/2&&(now2==0||now3==0)){
            printf("%d\n",nows);f=1;
            break;
        }
        if(now2==s/2&&(now1==0||now3==0)){
            printf("%d\n",nows);f=1;
            break;
        }
        if(now3==s/2&&(now1==0||now2==0)){
            printf("%d\n",nows);f=1;
            break;
        }
        if(now1!=0){
            if(!vis[0][now2+now1][now3]){
                vis[0][now2+now1][now3]=1;
                que1.push(0);que2.push(now2+now1);
                que3.push(now3);step.push(nows+1);
            }
            int c3=now3+now1,c1=0;
            if(c3>=m){ c1=c3-m;c3=m; }
            if(!vis[c1][now2][c3]){
                vis[c1][now2][c3]=1;
                que1.push(c1);que2.push(now2);
                que3.push(c3);step.push(nows+1);
            }
        }
        if(now2!=0){
            int c1=now2+now1,c2,c3;
            if(c1>n){ c2=c1-n;c1=n; }
            else c2=0;
            if(!vis[c1][c2][now3]){
                vis[c1][c2][now3]=1;
                que1.push(c1);que2.push(c2);
                que3.push(now3);step.push(nows+1);
            }
            c3=now2+now3,c2;
            if(c3>n){ c2=c3-m;c3=m; }
            else c2=0;
            if(!vis[now1][c2][c3]){
                vis[now1][c2][c3]=1;
                que1.push(now1);que2.push(c2);
                que3.push(c3);step.push(nows+1);
            }
        }
        if(now3!=0){
            if(!vis[now1][now2+now3][0]){
                vis[now1][now2+now3][0]=1;
                que1.push(now1);que2.push(now2+now3);
                que3.push(0);step.push(nows+1);
            }
            int c1=now1+now3,c3=0;
            if(c1>=n){ c3=c1-n;c1=n; }
            if(!vis[c1][now2][c3]){
                vis[c1][now2][c3]=1;
                que1.push(c1);que2.push(now2);
                que3.push(c3);step.push(nows+1);
            }
        }
    }
}
int main(){
    //freopen("lpp.in","r",stdin);
    //freopen("lpp.out","w",stdout);
    while(scanf("%d%d%d",&s,&n,&m)&&s!=0&&n!=0&&m!=0){
        if(s&1){ printf("NO\n");continue; }
        f=0;bfs();if(f==0){ printf("NO\n");continue; }
    }
}