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#include <stdio.h>
//Compiler version g++ 4.9
int getDivNr(int x){
int sum = 0;
for(int i = 2; i <= x/2; i++){
if( x % i == 0){
sum++;
}
}
return sum;
}
int main(void)
{
FILE *in, *out;
int n, sub = 0;
in = fopen( "fractii.in", "r");
out = fopen( "fractii.out", "w");
fscanf(in, "%d", &n);
for( int i = 2; i < n; i++){
sub += getDivNr(i) + n / i;
}
fprintf(out, "%d", n * n - sub);
return 0;
}