delete pics to save space

1.2735.cpp

@@ -0,0 +1,21 @@
+#include<cstdio>
+#include<algorithm>
+using namespace std;
+int n,m,p;
+inline int gcd(int a,int b)
+{
+	int t;
+	while(b) { t=b; b=a%b; a=t; }
+	return a;
+}
+int main()
+{
+#ifdef local
+	freopen("pro.in","r",stdin);
+#endif
+	scanf("%d%d%d",&n,&m,&p);
+	double S=m*p*0.5,I=p+gcd(n,m)+gcd(abs(n-p),m);
+//	printf("S=%lf I=%lf\n",S,I);
+	printf("%d\n",int(S+1-I*0.5+0.5));
+	return 0;
+}