34 lines
456 B
C++
34 lines
456 B
C++
#include <iostream>
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#include <cmath>
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using namespace std;
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int main()
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{
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int a,b,c,d,i,j,k,h,t;
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while(cin>>a>>b>>c>>d)
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{
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if(a==0&& b==0&& c==0&& d==0)
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break;
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else
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{
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if(a==b&& b==c&& c==d)
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t=0;
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else
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{
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t=0;
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while(a|| b || c|| d)
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{
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i=abs(a-b);
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j=abs(b-c);
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k=abs(c-d);
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h=abs(d-a);
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a=i,b=j,c=k,d=h;
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t++;
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}
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t-=1;
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}
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cout<<t<<endl;
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}
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}
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return 0;
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}
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