26 lines
450 B
C++
26 lines
450 B
C++
#include<stdio.h>
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#define N 1000000
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struct stdent
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{
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int p[N];
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}stu;
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int main()
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{int i,k;
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for(i=1;i<1000000;i++)
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{k=i;
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stu.p[i]=0;
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for(;k!=0;k/=10)
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if(k%10==4||k%100==62) {stu.p[i]=1;break;}
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}
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int a,b,t;
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while(~scanf("%d%d",&a,&b)&&(a||b))
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{t=b-a+1;
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for(;a<=b;a++)
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{
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t-=stu.p[a];
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}
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printf("%d\n",t);
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}
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return 0;
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}
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