diff --git a/task1/CodegenImpl.java b/task1/CodegenImpl.java
index 6dbd11f..2098b2b 100644
--- a/task1/CodegenImpl.java
+++ b/task1/CodegenImpl.java
@@ -56,7 +56,7 @@ public class CodegenImpl implements Codegen {
 			+ "mv t1,a0\n"
 			+ compileExpBinop(b.binop);
 		} else if (e instanceof Variable) {
-			int offset = ((Variable) e).x;
+			int offset = ((Variable) e).x - 1;
 			
 			return String.format("lw a0,%d(s0)\n", offset * 4);
 		} else if (e instanceof Invoke) {
@@ -131,7 +131,7 @@ public class CodegenImpl implements Codegen {
 			Assign assign = (Assign) e;
 
 			return compileExp(assign.e)
-			+ String.format("sw a0,%d(s0)\n", assign.x * 4);
+			+ String.format("sw a0,%d(s0)\n", (assign.x - 1) * 4);
 		} else if (e instanceof Continue) {
 			return "jr s2\n";
 		} else if (e instanceof Break) {
diff --git a/task2/CodegenImpl.java b/task2/CodegenImpl.java
index 6dbd11f..2098b2b 100644
--- a/task2/CodegenImpl.java
+++ b/task2/CodegenImpl.java
@@ -56,7 +56,7 @@ public class CodegenImpl implements Codegen {
 			+ "mv t1,a0\n"
 			+ compileExpBinop(b.binop);
 		} else if (e instanceof Variable) {
-			int offset = ((Variable) e).x;
+			int offset = ((Variable) e).x - 1;
 			
 			return String.format("lw a0,%d(s0)\n", offset * 4);
 		} else if (e instanceof Invoke) {
@@ -131,7 +131,7 @@ public class CodegenImpl implements Codegen {
 			Assign assign = (Assign) e;
 
 			return compileExp(assign.e)
-			+ String.format("sw a0,%d(s0)\n", assign.x * 4);
+			+ String.format("sw a0,%d(s0)\n", (assign.x - 1) * 4);
 		} else if (e instanceof Continue) {
 			return "jr s2\n";
 		} else if (e instanceof Break) {
diff --git a/task3/CodegenImpl.java b/task3/CodegenImpl.java
index 6dbd11f..2098b2b 100644
--- a/task3/CodegenImpl.java
+++ b/task3/CodegenImpl.java
@@ -56,7 +56,7 @@ public class CodegenImpl implements Codegen {
 			+ "mv t1,a0\n"
 			+ compileExpBinop(b.binop);
 		} else if (e instanceof Variable) {
-			int offset = ((Variable) e).x;
+			int offset = ((Variable) e).x - 1;
 			
 			return String.format("lw a0,%d(s0)\n", offset * 4);
 		} else if (e instanceof Invoke) {
@@ -131,7 +131,7 @@ public class CodegenImpl implements Codegen {
 			Assign assign = (Assign) e;
 
 			return compileExp(assign.e)
-			+ String.format("sw a0,%d(s0)\n", assign.x * 4);
+			+ String.format("sw a0,%d(s0)\n", (assign.x - 1) * 4);
 		} else if (e instanceof Continue) {
 			return "jr s2\n";
 		} else if (e instanceof Break) {