#include <bits/stdc++.h> #define ll long long using namespace std; ll aa,bb,zx=2147480000,f[2000005]; void work(ll x,ll ans) { if(x>=bb) { zx=min(zx,ans+x-bb); return; } f[x]=1; if(x>1&&f[x-1]==0) work(x-1,ans+1); if(f[x+1]==0) work(x+1,ans+1); if(f[xx]==0&&x!=1) work(xx,ans+1); f[x]=0; } int main() { cin>>aa>>bb; work(aa,0); cout<<zx; return 0; }