22 lines
332 B
C++
22 lines
332 B
C++
#include<cstdio>
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#include<algorithm>
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using namespace std;
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int n,x,res,now,v;
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int main()
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{
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#ifdef local
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freopen("pro.in","r",stdin);
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#endif
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scanf("%d%d",&n,&x);
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res=now=1; v=x;
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for(int i=2;i<=n;i++)
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{
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scanf("%d",&x);
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if(x==v+1) { v=x; now++; }
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else { v=x; now=1; }
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res=max(res,now);
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}
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printf("%d\n",res);
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return 0;
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}
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