44 lines
743 B
C++
44 lines
743 B
C++
#include <iostream>
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#include <string>
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#include <vector>
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#include <queue>
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#include <algorithm>
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#include <cstdio>
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#include <cstdlib>
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#include <cstring>
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/// This Contest and Compile does not support C++11.
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//#include <thread>
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//#include <mutex>
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//#include <condition_variable>
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//#include <functional>
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using namespace std;
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bool ck[1000100];
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char buff[16];
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int main()
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{
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for(int i=0;i<1000001;i++)
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{
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sprintf(buff,"%d",i);
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ck[i]=(strstr(buff,"4")!=NULL||strstr(buff,"62")!=NULL);
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}
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int n,m;
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while(1)
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{
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scanf("%d %d",&n,&m);
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if(!n&&!m) break;
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int cc=0;
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for(int i=n;i<=m;i++)
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{
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cc+=(int)!ck[i];
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}
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printf("%d\n",cc);
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}
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return 0;
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}
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