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23 lines
331 B
C++
23 lines
331 B
C++
#include <iostream>
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#include <iomanip>
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#include <cstring>
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#include <cstdio>
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#include <ctime>
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#include <cmath>
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using namespace std;
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int main(){
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int a,b,sum=0;
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scanf("%d%d",&a,&b);
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for(int i=a;i<=b;i++){
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int c=i;
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while(c){
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if(c%10==2){
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sum++;
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}
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c/=10;
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}
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}
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printf("%d",sum);
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return 0;
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}
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