diff --git a/pkg/vm/interop.go b/pkg/vm/interop.go
index 9f6e9af6a..b91f1ebc5 100644
--- a/pkg/vm/interop.go
+++ b/pkg/vm/interop.go
@@ -20,31 +20,31 @@ type interopIDFuncPrice struct {
 
 var defaultVMInterops = []interopIDFuncPrice{
 	{ID: interopnames.ToID([]byte(interopnames.SystemBinaryDeserialize)),
-		Func: RuntimeDeserialize, Price: 500000},
+		Func: RuntimeDeserialize, Price: 1 << 14},
 	{ID: interopnames.ToID([]byte(interopnames.SystemBinarySerialize)),
-		Func: RuntimeSerialize, Price: 100000},
+		Func: RuntimeSerialize, Price: 1 << 12},
 	{ID: interopnames.ToID([]byte(interopnames.SystemRuntimeLog)),
-		Func: runtimeLog, Price: 1000000, RequiredFlags: smartcontract.AllowNotify},
+		Func: runtimeLog, Price: 1 << 15, RequiredFlags: smartcontract.AllowNotify},
 	{ID: interopnames.ToID([]byte(interopnames.SystemRuntimeNotify)),
-		Func: runtimeNotify, Price: 1000000, RequiredFlags: smartcontract.AllowNotify},
+		Func: runtimeNotify, Price: 1 << 15, RequiredFlags: smartcontract.AllowNotify},
 	{ID: interopnames.ToID([]byte(interopnames.SystemEnumeratorCreate)),
-		Func: EnumeratorCreate, Price: 400},
+		Func: EnumeratorCreate, Price: 1 << 4},
 	{ID: interopnames.ToID([]byte(interopnames.SystemEnumeratorNext)),
-		Func: EnumeratorNext, Price: 1000000},
+		Func: EnumeratorNext, Price: 1 << 15},
 	{ID: interopnames.ToID([]byte(interopnames.SystemEnumeratorConcat)),
-		Func: EnumeratorConcat, Price: 400},
+		Func: EnumeratorConcat, Price: 1 << 4},
 	{ID: interopnames.ToID([]byte(interopnames.SystemEnumeratorValue)),
-		Func: EnumeratorValue, Price: 400},
+		Func: EnumeratorValue, Price: 1 << 4},
 	{ID: interopnames.ToID([]byte(interopnames.SystemIteratorCreate)),
-		Func: IteratorCreate, Price: 400},
+		Func: IteratorCreate, Price: 1 << 4},
 	{ID: interopnames.ToID([]byte(interopnames.SystemIteratorConcat)),
-		Func: IteratorConcat, Price: 400},
+		Func: IteratorConcat, Price: 1 << 4},
 	{ID: interopnames.ToID([]byte(interopnames.SystemIteratorKey)),
-		Func: IteratorKey, Price: 400},
+		Func: IteratorKey, Price: 1 << 4},
 	{ID: interopnames.ToID([]byte(interopnames.SystemIteratorKeys)),
-		Func: IteratorKeys, Price: 400},
+		Func: IteratorKeys, Price: 1 << 4},
 	{ID: interopnames.ToID([]byte(interopnames.SystemIteratorValues)),
-		Func: IteratorValues, Price: 400},
+		Func: IteratorValues, Price: 1 << 4},
 }
 
 func init() {