#include <iostream>
#include <cmath>
using namespace std;
int main()
{
int a, b, g = 0, j;
bool f = 0;
cin>> a >> b;
for(int i = a; i <= b; i++)
{
f = 0;
if(i == 1)
{
f = 1;
}
j = 2;
while(j <= sqrt(i) + 1 && f == 0 && j != i)
{
if(i % j == 0)
{
f = 1;
}
j++;
}
if(f == 0)
{
g++;
}
}
cout<< g;
}
#include
#include
using namespace std;int main()
{
int a, b, g = 0, j;
bool f = 0;
cin>> a >> b;
for(int i = a; i <= b; i++)
{
f = 0;
if(i == 1)
{
f = 1;
}
j = 2;
while(j <= sqrt(i) + 1 && f == 0 && j != i)
{
if(i % j == 0)
{
f = 1;
}
j++;
}
if(f == 0)
{
g++;
}
}
cout<< g;
}
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