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Cod sursa(job #402079)
#include<stdio.h>
int main()
{
freopen("pascal.in","r",stdin);
freopen("pascal.out","w",stdout);
int r,j,n,k1=0,k2=0,k3=0,d,p,c=0,i;
scanf("%d%d",&r,&d);
for(i=1;i<=r;i++){
if(i%d==0){
k1++;
}
}
for(j=0;j<=r;j++){
p=r-j;
for(i=1;i<=p;i++){
if(p%d==0){
k2++;
}
}
for(i=1;i<=j;i++){
if(i%d==0){
k3++;
}
}
if(k1-k2-k3>0){
c++;
}
k2=0;
k3=0;
}
printf("%d",c);
return 0;
}