【杭电】不要62

#include<stdio.h>
int s[10000001];
void judge() {
    int t=0;
    for(int l=0; l<1000000; l++) {
        int now,last=0,k;
        k=l;
        while(k) {
            now=k%10;
            if(now==4||now==6&&last==2) {
                t++;
                break;
            }
            k=k/10;
            last=now;
        }
        s[l]=t;
    }
}
int main() {
    int n,m;
    judge();
    while(scanf("%d %d",&n,&m),n||m) {
        printf("%d\n",m-n+1-s[m]+s[n-1]);
    }
    return 0;
}

杭电2089