delete pics to save space

1.2158.py

@@ -0,0 +1,33 @@
+from lib import *
+def main():
+    IO_inf.freopen("pro.in")
+    n=scanf("d")
+    if n==1:
+        print(0)
+        return
+    phi=Array(n)
+    phi[1]=1
+    isp=Array(n,dft=True)
+    isp[1]=False
+    cnt=0
+    p=Array(n)
+    for i in range(2,n):
+        if isp[i]:
+            p[cnt]=i
+            cnt=cnt+1
+            phi[i]=i-1
+        for j in range(0,cnt):
+            if i*p[j]>=n :
+                break
+            isp[i*p[j]]=False
+            if i%p[j]==0 :
+                phi[i*p[j]]=phi[i]*p[j]
+                break
+            else :
+                phi[i*p[j]]=phi[i]*(p[j]-1)
+    res=0
+    for i in range(1,n):
+        res=res+phi[i]
+    print(res*2+1)
+
+main()