38 lines
726 B
C++
38 lines
726 B
C++
#include <iostream>
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#include <algorithm>
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#include <stdio.h>
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#include <queue>
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#include <cmath>
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#include <string.h>
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using namespace std;
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int main()
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{
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long long L,R;
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while(scanf("%lld%lld",&L,&R)!=EOF)
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{
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if(L==R)
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{
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if(R<=1) puts("0");
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else if(R==2) puts("1");
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else puts("2");
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continue;
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}
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if(L==0)
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{
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if(R==1) puts("0");
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else if(R==2) puts("1");
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else printf("%lld\n",(R+1)/2);
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}
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else
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{
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if(L==1&&R==2) puts("1");
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else{
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if(L+2>=R-1) puts("2");
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else printf("%lld\n",(R-L+2)/2);
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}
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}
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}
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return 0;
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}
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