#include <iostream>
#include <stdlib.h>
#include <string.h>
using namespace std;
int main(){
char b[13], *tmp;
int len, count=0;
for(int a=1; a<=100; a++){
itoa(a, b, 10);
len=strlen(b);
for(int c=0; c<len; c++){
tmp=b[c];
if(!strcmp(tmp, "5"))count++;
}
}
cout<<count;
return 0;
}
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